Fixes #35: mandatory questions broken.

Rails 4.1 broke two items, one in SurveyorGui and one in Surveyor:

SurveyorGui - Active Record all method is deprecated and no longer takes
parameters.  Solution: rewrote dependency query in response_set_methods.

Surveyor - Rails 4.1 no longer returns the flash message type as a
symbol in flash.keys.  All symbols are returned as strings.

Since Surveyor seems like it may no longer be maintained (no changes
since Summer 2014), copied to the edit.html.haml view to SurveyorGui
and made the change there.