Merge branch 'bootstrap'
Merged with bootstrap
Added new course functionality
Merge branch 'master' of github.com:TeachBackTeam/TeachBack

"Course functionality"
added lecture creation
added lecture link
Added course columns
added pins to courses
Merge branch 'master' into bootstrap

Conflicts:
	app/views/courses/new.html.erb
	app/views/users/show.html.erb