Fixes SaveBundle missing mashups after saving
Fixes SaveBundle missing mashups after saving

* This caused errors on crowdlabs

db/services/io.py:
  - save_vistrail_bundle_to_zip_xml:
  - save_vistrail_bundle_to_db:
    Added mashup to returned SaveBundle

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