created ratings average
Merge pull request #22 from n2diving/frontendbranch

working on instructor view and calling the appropriate lesson for show
returns both a hash of the values and an average
small changes
Students can now access lesson show from home page
Merge pull request #23 from n2diving/modelmethods

Modelmethods
Merge pull request #24 from n2diving/students_views

Students can now access lesson show from home page
fixed data view, uncommented
lessons CRUD incorproated into instructor view
Merge pull request #26 from n2diving/lessons

lessons CRUD incorproated into instructor view
home page button directions and instructor and student new forms