enable multiple response sets on Instrument #3034
corrections based on feedback #3034

- preloaded surveys when loading response sets
- set instrument_break_off_code without database
hit
- in order for 'has completed' to show up in the
view, all response_sets are enumerated and the
collection is verified complete
Merge pull request #90 from NUBIC/bug_3034_make_instrument_response_set_work_correctly

Refactor Instrument#response_set to Instrument#response_sets #3034