OpenSceneGraph-3.3.9 developer release

OpenSceneGraph-3.3.9, released on 1st July 2015, key deliverables in this dev release are:

source package : OpenSceneGraph-3.3.9.zip

svn tag: svn co http://svn.openscenegraph.org/osg/OpenSceneGraph/tags/OpenSceneGraph-3.3.9 OpenSceneGraph