Fix a bug with packages that have namespaces with colons.
Fix a bug with packages that have namespaces with colons.

core/vistrail/port.py:
  - Port.find_port_types: add maxsplit=2 to split call on type_str



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