Merge pull request #152 from scapix/master

Lua runtime - Slot and animation - color/alpha out of range fix.
Comments.
Avoid boxing in Skin dictionary.

closes #156
changed texture loaded to pass the current context.
Merge pull request #158 from agmcleod/master

changed texture loaded to pass the current context.
Refactored AttachmentLoader, allowing parameters per attachment type. Added attachment path. Added per attachment color.
Merge branch 'origin/master'
Fixed bounding boxes when slot has no attachment.
Fixed C89 compilation.
Fixed SkeletonAnimation timeScale.
Changes for libgdx Batch refactoring.
Path for RegionAttachment.
Fixed root translation with yDown coordinates.

http://www.esotericsoftware.com/forum/viewtopic.php?f=9&t=1657
Fields shouldn't be public.
fix copy-paste error
Fixed findSlotIndex and findBoneIndex return 0 when not found instead of -1.
Fixed SkeletonBounds for spine-c.
Fixed usage of pairs() where ordered iteration is needed.

http://www.esotericsoftware.com/forum/viewtopic.php?f=7&t=1660
Fixed boolean parsing.
Fixed additive always being used.