Adds next lesson functionality. Needs validation work. Also tweaks README (again)
Changes next function to be RESTFUL.
Adds previous function and spec
Adds Section class, associations and specs, and some validations
Adds first Section routers, controllers, and index view
Adds show lessons for sections
Adds new section functionality
Adds create Section functionality
Adds delete Section functionality
Adds edit Section
Adds update Section
Adds functionality of Section's Lesson's details
Adds new Lesson with Section functionality
Adds BROKEN add Lesson function.  Currently adds to DB but routes as though there was an error.