Travis CI: site documentation update at 2014-12-11 17:57:54 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/8c8f18a961b5aa0c33c6a3b51b6a2885599087da

Message: Allow a material to refer to any texture unit. Optimize setting batch's material renderstate by only looping through the used texture units. Note: the material editor in the editor does not support the extra units yet.