Merge branch 'release/add-load-spinner'
Merge branch 'release/improve-spinner-css'
Merge branch 'release/add-course-or-lesson-headers'
Merge branch 'release/add-ordered-list-of-lessons'
Merge branch 'release/add-user-authentication'
Merge branch 'release/add-course-pages'
Merge branch 'release/add-admin-menu'
Added lesson list controller
Added lesson list and add action
Merge branch 'master' of https://github.com/groomycian/nouscourse into feature/add-lessons-admin-pages
edit and destroy action for lessons
Merge branch 'feature/add-lessons-admin-pages' into develop