Release version 1.0.23.

[bigeasy]

Once again; here is the release checklist mentioned in #140.

• Ensure that all the features, including updated TZ databases have already been committed to master before performing a release. Do not add new code in a release commit.
• Ensure that your change log is up to date with all the changes prior to 1.0.24. Do not edit the change log a bunch in a release commit.
• Create a git checkout -b release-1.0.24 branch.
• Checkout your release-1.0.24 branch.
• Update the version number in src/timezone.js to 1.0.24.
• Update the version number in t/version/get.t.js.
• Update the version number in package.json.
• Ensure that the CHANGELOG looks reasonable.
• Run make clean && make zic && make && npm test.
• Run git commit -m $'Release 1.0.24.\n\nCloses #329.' -a.
• Get the date of the commit and add it to change log.
• Run git commit --amend -a.
• Close this issue with that commit message.
• Run git tag v1.0.24 && git push origin v1.0.24.
• Merge release-1.0.24 into master with git checkout master && git splice release-1.0.24.
• Push master.
• Wait on Travis CI build to pass.
• Run make publish which will clear out .AppleDouble and .DS_Store before publishing and publish the build directory.

Publish data files to gh-pages.

• Go to your checkout of the gh-pages.
• In the code submodule run git fetch && git checkout v1.0.24 && git submodule update.
• In the code submodule make clean && make zic && make && npm test.
• In the root directory run NODE_PATH=code/build node data.js.
• Run git add v1.0.24.
• Run git commit -m $'Update GitHub Pages and data files for v1.0.24.\n\nSee #329.' -a.
• Push commit with git push origin HEAD.

Publish data files as zip. (This is specific to my checkouts.)

• You no longer need to disable Travis CI, there is a .travis.yml in the
  data branch.
• Go to your checkout of the data files.
• Add an entry in the README.md for v1.0.24.
• Run rm -rf amd json jsonp.
• Run rsync -av /home/timezone/pages/v1.0.24/ ./
• Run git add ..
• Run git commit -m $'Update data file archives for v1.0.24.\n\nSee #329.' -a.
• Run git tag data-v1.0.24 && git push origin data-v1.0.24.
• Push commit with git push origin HEAD.