diff --git a/package-lock.json b/package-lock.json
index 54c697c..b29506f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,7 +41,8 @@
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       "resolved": "https://registry.npmjs.org/acorn/-/acorn-2.7.0.tgz",
-      "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc="
+      "integrity": "sha1-q259nYhqrKiwhbwzEreaGYQz8Oc=",
+      "optional": true
     },
     "acorn-globals": {
       "version": "1.0.9",
@@ -146,7 +147,8 @@
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       "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU=",
+      "optional": true
     },
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@@ -260,11 +262,6 @@
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       }
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-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
-      "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8="
-    },
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       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
@@ -319,37 +316,12 @@
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-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
-      "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
-      "requires": {
-        "string-width": "^1.0.1",
-        "strip-ansi": "^3.0.1",
-        "wrap-ansi": "^2.0.0"
-      },
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-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-          "requires": {
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-          }
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       "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
       "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
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-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
-      "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
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@@ -367,6 +339,7 @@
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       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
       "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
+      "optional": true,
       "requires": {
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       }
@@ -376,6 +349,11 @@
       "resolved": "https://registry.npmjs.org/command-exists/-/command-exists-1.2.2.tgz",
       "integrity": "sha1-EoGcZPr5VEbsCuB/5sr7brNwiyI="
     },
+    "commander": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-5.1.0.tgz",
+      "integrity": "sha512-P0CysNDQ7rtVw4QIQtm+MRxV66vKFSvlsQvGYXZWR3qFU0jlMKHZZZgw8e+8DSah4UDKMqnknRDQz+xuQXQ/Zg=="
+    },
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       "resolved": "https://registry.npmjs.org/compressible/-/compressible-2.0.13.tgz",
@@ -497,7 +475,8 @@
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       "resolved": "https://registry.npmjs.org/cssom/-/cssom-0.3.2.tgz",
-      "integrity": "sha1-uANhcMefB6kP8vFuIihAJ6JDhIs="
+      "integrity": "sha1-uANhcMefB6kP8vFuIihAJ6JDhIs=",
+      "optional": true
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@@ -549,7 +528,8 @@
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       "resolved": "https://registry.npmjs.org/delayed-stream/-/delayed-stream-1.0.0.tgz",
-      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk="
+      "integrity": "sha1-3zrhmayt+31ECqrgsp4icrJOxhk=",
+      "optional": true
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@@ -707,7 +687,8 @@
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       "resolved": "https://registry.npmjs.org/extsprintf/-/extsprintf-1.3.0.tgz",
-      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU="
+      "integrity": "sha1-lpGEQOMEGnpBT4xS48V06zw+HgU=",
+      "optional": true
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     "fast-deep-equal": {
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@@ -834,7 +815,8 @@
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-          "bundled": true
+          "bundled": true,
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@@ -877,7 +859,8 @@
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-          "bundled": true
+          "bundled": true,
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@@ -890,6 +873,7 @@
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           "version": "0.0.9",
           "bundled": true,
+          "optional": true,
           "requires": {
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           }
@@ -897,6 +881,7 @@
         "boom": {
           "version": "2.10.1",
           "bundled": true,
+          "optional": true,
           "requires": {
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           }
@@ -904,6 +889,7 @@
         "brace-expansion": {
           "version": "1.1.7",
           "bundled": true,
+          "optional": true,
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@@ -911,7 +897,8 @@
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           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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@@ -925,30 +912,36 @@
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         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "combined-stream": {
           "version": "1.0.5",
           "bundled": true,
+          "optional": true,
           "requires": {
             "delayed-stream": "~1.0.0"
           }
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         "concat-map": {
           "version": "0.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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           "version": "1.1.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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         "cryptiles": {
           "version": "2.0.5",
           "bundled": true,
+          "optional": true,
           "requires": {
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           }
@@ -983,7 +976,8 @@
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           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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@@ -1010,7 +1004,8 @@
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         "extsprintf": {
           "version": "1.0.2",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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@@ -1029,11 +1024,13 @@
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         "fs.realpath": {
           "version": "1.0.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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         "fstream": {
           "version": "1.0.11",
           "bundled": true,
+          "optional": true,
           "requires": {
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             "inherits": "~2.0.0",
@@ -1084,6 +1081,7 @@
         "glob": {
           "version": "7.1.2",
           "bundled": true,
+          "optional": true,
           "requires": {
             "fs.realpath": "^1.0.0",
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@@ -1095,7 +1093,8 @@
         },
         "graceful-fs": {
           "version": "4.1.11",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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@@ -1119,6 +1118,7 @@
         "hawk": {
           "version": "3.1.3",
           "bundled": true,
+          "optional": true,
           "requires": {
             "boom": "2.x.x",
             "cryptiles": "2.x.x",
@@ -1128,7 +1128,8 @@
         },
         "hoek": {
           "version": "2.16.3",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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@@ -1143,6 +1144,7 @@
         "inflight": {
           "version": "1.0.6",
           "bundled": true,
+          "optional": true,
           "requires": {
             "once": "^1.3.0",
             "wrappy": "1"
@@ -1150,7 +1152,8 @@
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         "inherits": {
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+          "bundled": true,
+          "optional": true
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@@ -1160,6 +1163,7 @@
         "is-fullwidth-code-point": {
           "version": "1.0.0",
           "bundled": true,
+          "optional": true,
           "requires": {
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@@ -1171,7 +1175,8 @@
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           "version": "1.0.0",
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+          "bundled": true,
+          "optional": true
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@@ -1234,11 +1239,13 @@
         },
         "mime-db": {
           "version": "1.27.0",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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         "mime-types": {
           "version": "2.1.15",
           "bundled": true,
+          "optional": true,
           "requires": {
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           }
@@ -1246,17 +1253,20 @@
         "minimatch": {
           "version": "3.0.4",
           "bundled": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
         },
         "minimist": {
           "version": "0.0.8",
-          "bundled": true
+          "bundled": true,
+          "optional": true
         },
         "mkdirp": {
           "version": "0.5.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -1306,7 +1316,8 @@
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         "number-is-nan": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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@@ -1321,6 +1332,7 @@
         "once": {
           "version": "1.4.0",
           "bundled": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -1346,7 +1358,8 @@
         },
         "path-is-absolute": {
           "version": "1.0.1",
-          "bundled": true
+          "bundled": true,
+          "optional": true
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@@ -1355,7 +1368,8 @@
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         "process-nextick-args": {
           "version": "1.0.7",
-          "bundled": true
+          "bundled": true,
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@@ -1388,6 +1402,7 @@
         "readable-stream": {
           "version": "2.2.9",
           "bundled": true,
+          "optional": true,
           "requires": {
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@@ -1430,13 +1445,15 @@
         "rimraf": {
           "version": "2.6.1",
           "bundled": true,
+          "optional": true,
           "requires": {
             "glob": "^7.0.5"
           }
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         "safe-buffer": {
           "version": "5.0.1",
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+          "bundled": true,
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@@ -1456,6 +1473,7 @@
         "sntp": {
           "version": "1.0.9",
           "bundled": true,
+          "optional": true,
           "requires": {
             "hoek": "2.x.x"
           }
@@ -1486,6 +1504,7 @@
         "string-width": {
           "version": "1.0.2",
           "bundled": true,
+          "optional": true,
           "requires": {
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@@ -1495,6 +1514,7 @@
         "string_decoder": {
           "version": "1.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
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@@ -1507,6 +1527,7 @@
         "strip-ansi": {
           "version": "3.0.1",
           "bundled": true,
+          "optional": true,
           "requires": {
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           }
@@ -1519,6 +1540,7 @@
         "tar": {
           "version": "2.2.1",
           "bundled": true,
+          "optional": true,
           "requires": {
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@@ -1568,7 +1590,8 @@
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+          "bundled": true,
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@@ -1593,7 +1616,8 @@
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         "wrappy": {
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-          "bundled": true
+          "bundled": true,
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@@ -2035,7 +2059,8 @@
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+      "integrity": "sha512-QLg82fGkfnJ/4iy1xZ81/9SIJiq1NGFUMGs6ParyjBZr6jW2Ufj/snDqTHixNlHdPNwN2RLVD0Pi3igeK9+JfA==",
+      "optional": true
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     "html-entities": {
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@@ -2104,11 +2129,6 @@
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       "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
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-      "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-1.0.0.tgz",
-      "integrity": "sha1-EEqOSqym09jNFXqO+L+rLXo//bY="
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@@ -2145,14 +2165,6 @@
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       "integrity": "sha1-rEaBd8SUNAWgkvyPKXYMb/xiBsA="
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-      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
-      "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
-      "requires": {
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@@ -2324,14 +2336,6 @@
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-      "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
-      "integrity": "sha1-MIrMr6C8SDo4Z7S28rlQYlHRuDU=",
-      "requires": {
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@@ -2580,21 +2584,14 @@
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-      "integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0="
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-      "resolved": "https://registry.npmjs.org/nunjucks/-/nunjucks-3.1.2.tgz",
-      "integrity": "sha512-pJXncV07mmiuIDL9OqdNkcpvifuDMzMq9qBQT9SHasAS7AEwzNp/r/jHNl+9O0+zsldcdWG9ZtXo/nwu2cTqXA==",
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/nunjucks/-/nunjucks-3.2.4.tgz",
+      "integrity": "sha512-26XRV6BhkgK0VOxfbU5cQI+ICFUtMLixv1noZn1tGU38kQH5A5nmmbk/O45xdyBhD1esk47nKrY0mvQpZIhRjQ==",
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-        "postinstall-build": "^5.0.1",
-        "yargs": "^3.32.0"
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@@ -2693,14 +2690,6 @@
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-      "requires": {
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@@ -2752,15 +2741,11 @@
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-      "integrity": "sha1-uRepB5smF42aJK9aXNjLSpkdEbk="
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-      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ="
+      "integrity": "sha1-IZMqVJ9eUv/ZqCf1cOBL5iqX2lQ=",
+      "optional": true
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@@ -2790,7 +2775,8 @@
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-      "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4="
+      "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
+      "optional": true
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@@ -3088,26 +3074,6 @@
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-      "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
-      "requires": {
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-        "strip-ansi": "^3.0.0"
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-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
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@@ -3418,36 +3386,12 @@
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 }