Changed System.rotateScreen property to rotateScreenVisible
Added System.webGL attribute
Added System.resize method
Fixed chained tween start parameter
Merge branch 'master' into develop
Cleaned code
Docs update
Update tween.js to include onRepeat callback
Added hiresWidth and hiresHeight attributes to System class
Added experimental aspectRatio attribute to System class
Renamed resize attribute to scale on System class
Fixed default orientation back to portrait
Improved background color/image syntax
Added background color/image support for desktop
Added background position support
Merge pull request #71 from justinmccombs/develop

Update tween.js to include onRepeat callback
Fixed WebGL to be disabled by default
Fixed chained tween start parameter (again)
Fixed game.scene not accessible (#73)
Added strict mode to keyboard, tween and sprite modules
Fixed code style to JSCS valid
Improved core module syntax
Added coreModules property to Core class
Fixed code style
Fixed loader to work without audio module
Fixed coreModules defining before loading core module
Code style fix
core.js - add iPod detection