now looking for texture variants by trying scale factors in steps of "1x"

Previously, the scale factors were tried by dividing by two (4, 2, 1), now it's minus one (4, 3, 2, 1). That's required because the iPhone 6 Plus uses a scale factor of "3".
added 'region' to SPSubTexture
added 'snapshot' methods to SPContext
comment fix
added subscripting and 'children' property to SPDisplayObjectContainer
added SPColor functions, deprecated SP_COLOR macros

* swift can’t import function macros, so regular functions are required
for import
added 'trimQuadBatches' to SPRenderSupport
added 'nextTween' and 'tweenWithTarget' methods
added 'debugQuickLookObject' to SPTexture

* can now view textures in the debugger
indent fix
Merge pull request #25 from Gamua/master

merge Gamua