Added C++ / script integration samples, which reimplement AnimatingScene sample, but use a script object instead of a C++ component.
Added Execute() function to LuaScriptInstance.
Fixed LuaScriptInstance::SetScriptFileName() not loading the script.


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2645 3bd170d8-ddcf-f82c-f583-7a401ccf5608