added background to student profiles and tests are passing
added migration file for adding background to student
Merge branch 'master' into goalsandbackground

* master:
  Completed creation of assignments and milestones
  Fix instructor course and event creation.
  Scope interactions to a particular (enrolled) course. WIP: enrollments and course management.
  Instructors Oauth via Github; Course management is @wip, pending refactor in next commit.
  Add Exercises to inquizator repo; WIP of exercises test
  update README
  Individual materials are rendered in markdown via the Github API

Conflicts:
	app/controllers/student_profiles_controller.rb
	app/models/user.rb
	app/views/student_profiles/show.html.haml
	app/views/users/edit.html.haml
	db/schema.rb