Wrap functionality in if tags to prevent errors

On every GitHub page but the profile overview there were errors
thrown because MutationObserver needed a node, not null
Complete rewrite in CoffeeScript
Create CoffeeScript class
Add event listner on pjax site change
Fix bug where color mapping failed
Remove pjax handler, we'll do that later
add note about UX and missing features
Merge pull request #6 from bahlo/coffee-script

CoffeeScript class
bump to 0.8.3
Add CoffeeScript note
parse updated markup for stats
got coffeescript version working after all
Merge pull request #10 from jasonlong/work-with-new-stats-layout

Work with new stats layout
ignore all zip files
fix coffeescript 'this' problem, bump to 0.8.5
Move aria-label onto <a> and remove <span> to make the switches accessible
Merge pull request #13 from muan/muan/aria

Make the switches accessible
bump to 0.8.6
run on any http(s) URL so that GHE can also use it
Merge pull request #15 from jasonlong/enable-ghe

run on any http(s) URL so that GHE can also use it