Add material shader animation.
Bind material parameter animation to Lua and AngelScript, Add MaterialAnimation sample.
Update attribute animation doc. [ci skip]
Remove AttributeAnimationInstance and MaterialShaderParameterAnimationInstance files.
Add Load and save for material shader animation.
Travis CI: API documentation update at 2014-04-21 14:19:03 UTC.
[ci package]
For Travis CI - switch CI build to use OS X build environment.