Making tabs in list active
Changing styles
Merge branch 'feature/material_and_task_in_course' into staging

Conflicts:
	app/views/layouts/web/shared/_courses_nav.html.haml
	app/views/layouts/web/shared/_my_courses_nav.html.haml
Merge branch 'feature/session_and_pages_58_86' into staging

Conflicts:
	app/views/web/sessions/_sign_in.html.haml
Changing model of courses
Merge branch 'feature/material_and_task_in_course' into staging
Reversing changes
Merge branch 'feature/material_and_task_in_course' into staging