Set --no-document in .gemrc for Travis builds.
Add --- to yml files.
Use punctuation for comments in .travis.yml.
MathJax cdn uses https.
Bump jekyll to 2.2.0.
Bump coffee-script to 2.3.0.
Bump firebase library versions.
Bump remodal to 0.2.0.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Gemfile