Added test for osgGA::GUIEventAdapter
Removed redundent spaces
Changed NodeVisitor so that is subclasses from osg::Object rather than osg::Referenced to enable it to be used with serialization and scripting
Added support for passing parameters in and out of scripts.

Implemented support for osg::ValueObject in LuaScriptEngine.
Merge branch 'master' of https://github.com/openscenegraph/osg into Dev