Travis CI: site documentation update at 2014-05-31 23:51:54 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/e079878e40bce76ecbba3c690a64dd36e4919e57

Message: Remove the gather4 path similarly from HLSL FXAA3. Fix FXAA2 tag name in the examples. Removed dead link from documentation.