Travis CI: site documentation update at 2014-08-31 19:01:35 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/89074cf668fd497ab8052c309f4ca02c0dda4495

Message: Added image save as png to a Serializer stream. Due to stb_image_write limitations, the format is always png. Block-compressed (DXT etc.) image data is not supported. Closes #441.