Merge pull request #27 from andrewjadams3/api

Api
Updated controllers and serializers for API
Update signup with class code, update models, remove join table
Merge pull request #28 from andrewjadams3/update-login

Update signup with class code, update models, remove join table
Working on Student templates and routes
Merge branch 'master' of https://github.com/andrewjadams3/Classwork into api
Added studentapp side routes and templates