creative destruction

unnecessarily complicated evolutionary legacy
User's symptoms & symptom sets
Revert "User's symptoms & symptom sets"

This reverts commit 77e3bbf159e66701fe20cf26c5a53b920f30b865.
added before_filter: signed_in_user to
symptom set form and associated models
symptom set and associated models #2
bare minimum symptom submission working
bare minimum symptom set submission working