<bugfix>is_running_gui missing in VistrailsServerSingleton</bugfix>
<bugfix>is_running_gui missing in VistrailsServerSingleton</bugfix>

gui/application_server.py:
- VistrailsServerSingleton.is_running_gui: *new
returns true

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