Updated StudentRaces such that a Student can have multiple enumerated races
Validation for student gender and hispanic status. Removed race stuff since it no longer lines up with data model.
Changed the way Students and Races are associated
Changed the way Students and Races are associated
Fixed association between Student and Race via StudentRace
Race choices now display as check boxes (needs some styling love)
Fixed bug in association between Students and Race
Added checks to make sure at least one race is chosen
Committed enrollment_controller with USE_NEW turned off
Merge pull request #140 from codeforamerica/student-gender-race-validation

"Shout" or What Jeff has been doing :-) or Added validations for gender, ethinicity, and race