Add closed spline end point's tangent calculate.[ci skip]
Demonstrate usage of spline interpolated animation, and set animation to node's world position(animation only attribute).
Move wrap mode out of ObjectAnimation.h.[ci skip]
Add scene attribute animation update event.
Travis CI: API documentation update at 2014-04-12 06:20:48 UTC.
[ci package]
For Travis CI - switch CI build to use OS X build environment.