Merge pull request #5 from ratalaika/master

Update dev
Added a game template.
Updated the grunt task file.
Updated some files for documentation.
Merge branch 'dev' of https://github.com/ratalaika/flixel-js into dev
Updated the device checker.
Added clone method to FlxRect.
Updated FlxGame.
Updated some rendering parts to increase performance.
Added double buffering to increase performance.
Fixed some performance issues with the texts.
Fixed a problem in the Device.js file.
Added variable time step.
Changed a bit the way the games load, moved loader initialization internally, now we use a callback to add resources to load..
Updated BitmapData to increase performance a bit.
Removed docs folder. Now you can generate it using "grunt docs".
Fixed previous commit.
Ready for 1.1.0 lunch!
Cleaned old stuff.