Travis CI: site documentation update at 2014-03-09 01:50:07 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/2529f4c51aa12d41195740b0003ee91838ae23f4

Message: Added IsNaN() to Vector2, Vector3, Vector4, Quaternion. Safeguard against Node::LookAt() misbehaving if target is very close. Closes #231.