Store best score in localStorage

Dependency injection and hide best score for incompatible browsers
Fix win/over in local
localStorage fallback
Merge remote-tracking branch 'upstream/master' into best-score

Conflicts:
	index.html
	js/application.js
	js/html_actuator.js
Add launcher icon for :apple: devices
Hide the browser UI on :iphone:
Add metadata images to meta folder for consistency
Fix relative path issue - github.io vs. CNAME
Use querySelector instead of getElementsByClassName
Merge pull request #22 from ghoullier/master

Use querySelector instead of getElementsByClassName
fix merge conflict
add small code tweaks
mobile tweaks for best score
remove analytics from master branch
Endless Game. Allow user to continue the game.

- main.css isn't compiled
- a special class `.tile-gold` is added to tiles above 2048
add mentions to readme
add screnshot section
small change in scoremanager
improve code structure in localscoremanager
compile main.css