Fixes Lesson create redirect to Section
Adds delete Lesson in Section
Adds edit Lesson in Section
Fixes edit lesson in Section redirect.  Stupid double quotes.
Adds edit Lesson from Lesson details
Adds return to Section Lessons from Lesson Details
Adds return to Section index from Section show
Fixes next Lesson for inside Section
When creating a new lesson, makes default dropdown choice the Lesson the user was in
Expands homepage to show all Section's Lessons
Corrects Gemfile to have bootstrap in Production
Adds rails_12factor gem for Heroku
Changes Lesson Number listing to default_scope
Changes Section by ID listing to default_scope
Adds bootstrap bottom Nav Bar with Next Lesson functionality
Adds Nav Bar prettiness AND Fixes bug with Next and Previous functions throwing errors with Nav Bar
Updates README some