Fix importing.

When loading services from a django shell it would just silently exit. This
was because the ChopShop service plays around with sys.stdout and sys.stdin,
so as soon it was imported the shell lost stdin. For now, only do that when
the service is instantiated.
Make OPSWAT work on objects.
Rename context to obj in ANB.

This service doesn't actually do anything via the normal framework, but might
as well rename it to be consistent.
Update carver service to not use context.
Make chopshop not use contexts.
Make data_miner work on objects.
Make entropycalc service work on objects.
Make macho work with objects.
Make metachecker work on objects.
Make metacap work with objects.
Make officemeta work on objects.
Make passive total work on objects.
Make pdfinfo work on objects.
Make peinfo work on objects.
Make pyew run on objects.

No real change here, just renaming an unused variable.
Make relationships service work on objects.

No real change here, just renaming an unused variable.
Make snugglefish work on objects.

No real change here, just renaming an unused variable.
Make ssdeep work on objects.
Make timeline service work with objects.

No real change here, just renaming an unused variable.
Make UPX work on objects.