Store best score in localStorage

Dependency injection and hide best score for incompatible browsers
Fix win/over in local
improve bitcoin popup for mobile
svg bitcoin icon
Minor fixes to README
add WASD controls (closes #10)
Merge branch 'master' into gh-pages
Merge pull request #13 from remram44/readme-fixes

Minor fixes to README
localStorage fallback
Merge remote-tracking branch 'upstream/master' into best-score

Conflicts:
	index.html
	js/application.js
	js/html_actuator.js
Replace hammer with touch event handling
Merge pull request #16 from chrisprice/master

Replace hammer with touch event handling
remove hammer, small js changes
update css
Merge branch 'master' into gh-pages
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