Travis CI: site documentation update at 2014-04-21 17:29:44 UTC.

Commit: https://github.com/urho3d/Urho3D/commit/125000454c618170f7eddf8a6a9759088deb3341

Message: Refactor samples to use patched screen joystick layout. Closes #321.
Enhance screen joystick to also support mouse button binding. It can be used in combination with key binding, e.g. to bind SHIFT+LMB.