Merge pull request #721 from palantir/tokamoto/gh-page-update

Fixed Jekyll build fail / Added Travis CI
[feat] Upgrade Plottable, add pretty scatterplot example, update version #
[minor] Fix a typo
Clean up example code a bit
[minor] Bump version number
Add in .js, .css, and .d.ts from v0.23.0.

For tutorials and ease of use.
Updated built files from v0.23.1
[fix] Remove cruft from tutorial
Add code-syntax-ification of pieces of code and variable names
Fixed merge conflicts.
Updated gems, bump version to 0.23.0
Reworked homepage. Fixed examples page, added Components holding page.