Add tests

[benglass]

Specifically it would be nice to have a web/functional test that filled out the survey just to make sure every step redirect to the right place based on the answer and returned a 200 status so we can be sure any change didn't break the survey.

[benglass]

Added integration test in 0ea96cd which should test the various paths through the survey in terms of answer to the questions and make sure you end up with the results in terms of whether you are shown food shelves. This doesnt test validation (missing zip, food description) or whether the data is being saved properly throughout or anything except that clicking on the various combinations of answer buttons follows the right flow and results in the correct end result in terms of whether food shelves are shown or not.