Merge pull request #11 from leomuona/master

Bullet ragdoll in the works. Todo: Connect joints.
Fixed single frame animations.
Collada parser identifies the authoring tool.
Forgot to add this in 26a6a811.
Blender exported COLLADA anims now working :)
Animation cross-fades.

Working demo, moves with WASD, also changed to use Blender exported
COLLADA files. Also had to change things around with rendering class
and made a new AnimationLibrary singleton class.

Generic Character class that Player derives, in overall, this does
simplify things.
Replaced standing animation.
Joint now includes constraint data to parent joint.