Updated version
Fixed Pixi version
Fixed mediaFolder on Core
Fixed mediaFolder on Video
Fixed mediaFolder on System
Cleaned throw functions
Added error callback to audio loading
Optimized Audio code
Fixed setPlaybackRate on Audio
Fixed audioId issue
Fixed audio volume, when muted
Added exit method to Scene
Fixed audio stop on scene change to not apply on first scene
Fixed audioId to start from 1
Fixed documentation, close #113
Updated readme
Fixed audio play on IE
Optimized SpriteSheet code
Added array support to anim method in SpriteSheet
Fixed swipe to work without swipeTime on Scene
Fixed Loader not working between scenes
Cleaned Core code
Added initRenderer method to System
Updated contributing guide