Travis CI: site documentation update at 2014-02-17 21:24:13 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/0e5d11541fa0b00fba5426bd0199b9798272387c

Message: Fix missing root of shader precache file if loading it fails. Reset (clear) XMLFile when loading fails so that no illegal content will be saved when it's programmatically modified and then saved.