Travis CI: site documentation update at 2014-04-10 13:59:30 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/89391797870cdcffe7d85db87a8f12a2c8b4ce1a

Message: Refactor to use small case for xml tag and attribute names.
It is for consistency sake with existing code base. Exclude tag and attribute names from external XML declaration.
This commit may break user-created Urho2D XML resources.