First Polymer commit
Merge branch 'master' into prototypes/polymer

Conflicts:
	index.html
Add titles to size reports
Add gh-pages plugin, add more folders to extras
Cleanup unused files
Strip useless front matter, trim Hangman entry
Stop using 'html', some fixes
Ignore more things
Rework build and watch flow
Tweak css a bit
Merge branch 'prototypes/polymer'