-[SPINE] Spine.js file only contains the spine runtime, modifications needed made it to the official library. https://github.com/EsotericSoftware/spine-runtimes/pull/315
-[SPINE] Separates the PIXI.Spine portion into its own file, allows for easier spine.js library updates. Implements new loading system, IK, per bone flip and skinned mesh attachments.
-[STRIP] Added GL_TRIANGLES drawing mode besides of GL_TRIANGLE_STRIP. Should the name be changed from Strip to Mesh?
-[LOADER] Json loader now loads spine files as per the new implementation.
-[GRUNT] Added new PIXISpine.js file to grunt project.
-[HOUSEKEEPING] Replaced tabs with spaces for format consistency.
-[HOUSEKEEPING] Some typo fixes.
-[HOUSEKEEPING] Spelling mistake verticies --> vertices
-[HOUSEKEEPING] Refactored canvas drawing functions for readability.
Merge branch 'Trompo-SpineUpdate' of github.com:TrompoGames/pixi.js into trompo-dev

Conflicts:
	Gruntfile.js
	src/pixi/extras/PIXISpine.js
	src/pixi/extras/Strip.js
	src/pixi/loaders/JsonLoader.js