Pass window resized event (due to device orientation change) from SDL to Urho3D::Graphics class for both Android and iOS as well. Note that the event is only sent when the application has not locked the orientation. Minor code cleaned up on LuaScript subsystem.

git-svn-id: http://urho3d.googlecode.com/svn/trunk@2609 3bd170d8-ddcf-f82c-f583-7a401ccf5608