OpenSceneGraph 3.1.5 development release

OpenSceneGraph-3.1.5, released on 12th March 2013, key deliverables in this dev release are:

source package : OpenSceneGraph-3.1.5.zip
svn tag: svn co http://svn.openscenegraph.org/svn/osg/OpenSceneGraph/tags/OpenSceneGraph-3.1.5 OpenSceneGraph