Getting the code to build on windows

Making the code C98 compliant so it can build using VS2010.
Merge remote-tracking branch 'upstream/master'
Remove the IPCH cache that shouldn't be in source control
Fix for negtive scale in the X for an attachment working.
Merge pull request #38 from executionunit/master

VS2010 build and Fix for Negative Scale in X
Fixed up remaining issues to make spine-c C89.
Support new libgdx JSON stuff. Alpha for slot lines with debug renderer.
Reenable spineboy.
Fixed up conversion warnings in VS2010.
Renaming project files to lowercase.
Renaming project files to lowercase.
Removed ReadMe.txt.
Ctor for C++.
Fixed issue #36.
Fix for including in .mm file.
Fixed memory leaks in spine-c
Merge pull request #39 from executionunit/master

Fix for Memory leaks in spine-c
AnimationState gets addAnimation methods for chaining animations.

Tabs, not spaces!
Merge branch 'master' into monogame