Fix bug where changing an uniform glsl parameter didn't actually cause it to be updated.  Previously it was only updated when the shader was  recompiled.
Fix bug where changing an uniform glsl parameter didn't actually cause it to be updated.  Previously it was only updated when the shader was 
recompiled.

The problem was that the activate and changed methods did not call updateParameters. Now they do.


git-svn-id: 6c7e10cdde2c115f53707ba8ec4efe535f92d362@283 4683daeb-ad0f-0410-a623-93161e962ae5

jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG,jondo2010/OpenSG