Updated MatlabBridge to 0.3.0

Minor enhancements and bugfixes, see details at: https://www.assembla.com/spaces/dG15GuCs4r4l4UeJe5cbCb/tickets?report[id]=0&report[milestone_id_cond]=0&report[milestone_id_val][]=3928763&report[title]=MatlabBridge+0.3.0+Tickets
Merge pull request #368 from SlicerRt/update-MatlabBridge

Updated MatlabBridge to 0.3.0