<bugfix>Change persistence package to use correct identifier for gui widgets</bugfix>
<bugfix>Change persistence package to use correct identifier for gui widgets</bugfix>

vistrails/packages/widgets.py:
  - PersistentPathConfiguration.set_values: get rid of ".exp" artifact
  - PersistentPathConfiguration.get_values: get rid of ".exp" artifact

hjanime/VisTrails,Nikea/VisTrails,minesense/VisTrails,celiafish/VisTrails,hjanime/VisTrails,hjanime/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,minesense/VisTrails,VisTrails/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,minesense/VisTrails,minesense/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,celiafish/VisTrails,Nikea/VisTrails,minesense/VisTrails