Resolves "Failed to determine field name for 'id'" errors when doing API gets for Need or Project entities using id fields. The undefined_fields key is still improperly set and needs to be addressed, but the API is now usable at least.
Updated postProcess. Assignment fields activity_date_time, subject, and time_scheduled_minutes are now populated by associated Need.
Merge pull request #72 from fjg-conflux/api_fixes

Resolves "Failed to determine field name for 'id'" errors when doing API gets for Need or Project entities using id fields.
Merge pull request #73 from fjg-conflux/vol_sign_up

Updated postProcess. Assignment fields activity_date_time, subject, and time_scheduled_minutes are now populated by associated Need.
default status to completed
Merge pull request #75 from yashodha/civivol

default status to completed