Add test about matrix inverse
Add test about matrix inverse

cedricpinson/osgjs,kkuunnddaannkk/osgjs,cedricpinson/osgjs,gideonmay/osgjs,hishamabdelrahman/osgjs,kkuunnddaannkk/osgjs,jtorresfabra/osgjs,hishamabdelrahman/osgjs,cedricpinson/osgjs,gideonmay/osgjs,jtorresfabra/osgjs,hishamabdelrahman/osgjs,kkuunnddaannkk/osgjs,jmirabel/osgjs,gideonmay/osgjs,jmirabel/osgjs,jtorresfabra/osgjs,jmirabel/osgjs