Travis CI: site documentation update at 2014-05-12 20:18:26 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/84d06d2e61188292ca99a739313c462e982526b2

Message: Merged the face camera boolean and axes parameters used by BillboardSet & Text3D into a FaceCameraMode enum. Implement none, rotate XYZ, rotate Y, lookat XYZ & lookat Y modes. More can be added as necessary.