Add missing s to show_all_courses url
Change show_course_students URL to be more consistent.
Replace show_course_students URL with course_url.
Update show_course_students with a course_url parameter
and properly 404 a non-existing course.
Update show_course_students in tests and templates
Updated show_submitted_solutions to work with a course_url.
Added custom 500 and 404 error pages
Fixed profile.html link to submitted solutions
Update solutions to use a course_url
Merge pull request #44 from HackBulgaria/urls

Urls