Merge pull request #27 from n2diving/frontendbranch

home page button directions and instructor and student new forms
cleaning up lesson model error
Merge pull request #28 from n2diving/lesson_model

cleaning up lesson model error
working on lessons show. listing users via their ratings.  still showing duplicates
api work, json
Merge pull request #29 from n2diving/d3cleanup

D3cleanup
working on home page view and arrows