TextureAtlas optimization and support for rotated regions

- added support for rotated texture regions
- added inner sortedNames list to optimza search of regions by prefix
and specific logic for getSortedNames and getNumOfTextures
- added inner enum for region struct access
Fix on TexturePacker.parseMoaiFormat / Moai and Corona format loader

- fixed parseMoaiFormat, wrong y was calculated on texture regions
- added loadMoaiFormat and loadCoronaFormat that makes a dofile on
provided lua filenames and directly call the related parse*Format