Basic models for course and lesson

* Controllers api/course api/lesson
* Models for course and lesson
* Migrations for course and lesson
* Gem for serialization
* Gem for Model documentation
Added serializers for course and lesson

* Fixed bug on serializer that nested the json payload within a sub key
Lesson index correctly filters by course
Made api endpoints more robust

* Error messages now provided if resources not found
* Lessons endpoints now enforce that course id matches
* Added seeds.rb to seed the database
* Added non null constraints on course and lesson fields
Create Lesson page stub
Create Lesson Page Stub
Create Lesson Styling
Class Name Change
Javascript Linking
Proper JS/CSS Linking; Eduki Nav Bar
Page Set Up for View and Create Lesson
JS/CSS linking correctly
Adding javascript
Reintroduce Button within Form
Merge branch 'PageSetup' of github.com:Eduki/eduki into PageSetup

Conflicts:
	app/views/static/lesson.html.erb