Added 3.4 press release to NEWS.txt
Added 3.4 press release to NEWS.txt

tomasthoresen/osg,openscenegraph/osg,openscenegraph/osg,tomasthoresen/osg,artoolkit/osg,tomasthoresen/osg,marchelbling/osg,jtorresfabra/osg,scrawl/osg,jtorresfabra/osg,jtorresfabra/osg,tomasthoresen/osg,marchelbling/osg,artoolkit/osg,artoolkit/osg,scrawl/osg,jtorresfabra/osg,openscenegraph/osg,openscenegraph/osg,scrawl/osg,marchelbling/osg,marchelbling/osg,scrawl/osg,artoolkit/osg