Fixes error handling when job-check fails
Fixes error handling when job-check fails

gui/job_monitor.py:
 - update_jobs:
   Fixes call to debug.critical
 - timerEvent:
   Set updating_now in try/finally block so that it always gets called

Ref #27

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