Travis CI: site documentation update at 2014-12-13 18:21:06 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/769f314c55c6cb41dcb21238776974023beaec8a

Message: Update SoundSource's effective master gain on demand when master gains or sound type changes instead of in the mixing thread to avoid potential issues when the master gain map is being changed at the same time.