Course and Section controller + foundation

Overview accomplished
- Added Foundation Framework
- Ability to Add Courses and Sections related to them. 
- I've also checked the Database and every time a Course and Section is created, they are actually in the database with the correct relationships
- Seeded some categories
(Don't know how to seed courses and sections (since they have to be related to a signed in user)

Possible next steps:
- Course show page (with links to the section page)
- nav bar (with +, Course, Search and User tabs) as a partial to be added at the top of all pages  (or in layout)
- Ability to add Content (parse pretty version).
- Edit Course Name and description (within Course show page)
- Edit Section (on Sections index)