Run tests on CI

[macklinu]

Travis or whichever CI service(s) you'd like to use 👍

[glensc]

Tests need to be fixed so that they don't rely on time when the tests are run:

• Tests: Update jest snapshots #50

[glensc]

Date patch included in this pr:

• Fix license fetch from versions if root level license is missing #60

[glensc]

Created separate PR:

• Test: Freeze npm metadata snapshot dates #62