Travis CI: API documentation update at 2015-05-17 14:02:01 UTC.
Commit: https://github.com/urho3d/Urho3D/commit/f9f920964f5e0d8af426f7fb4317f2af1141848c
Message: Remove agents & obstacles on OnNodeSet(null), similar to Drawables. Do not allow adding an agent when node is already null. Added missing enum in AngelScript navigation API. Do not keep a persistent array of agent handles in the AngelScript crowd example, as that keeps the agents alive even past removal from scene. Closes #729.
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