Make API POST responses more useful.

Include useful information like the TLO type, ObjectId, Details URL, and
a return code. Documentation included in the Help on the "standard"
response format, return codes, and situations where the format differs.

This required updating several handlers to include (in some way) getting
the ObjectId from the created TLO. Also fixed a couple bugs along the
way (orphaned imports, variables, etc.).
Merge pull request #205 from crits/api_responses

Make API POST responses more useful.