Travis CI: site documentation update at 2014-09-11 22:27:38 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/6f980453b6417be276e85bd88eb1d309d0d806e0

Message: Added success return value to Image::FlipVertical(). Fixed return value of Image::Resize() in AngelScript bindings.