Travis CI: site documentation update at 2014-07-22 19:33:55 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/4a9ab417a829c5a6c6bcea320b46dadfb76bd887

Message: As a possible fix to #409, remove the optimization to not mark a node dirty again if it is already dirty. As a consequence the TransformChanged() script function will work more logically. This change would cause reduced performance with a large amount of animating models; to counteract, introduce a "silent update" mechanism for node transforms.