Travis CI: site documentation update at 2014-07-16 13:46:22 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/e82b3d53a1a99fcffb1d75062acaed93496326c2

Message: Added support for zones defining a texture (either cube or 3D), that will be available in pixel shaders when rendering objects inside the zone.