added relationship for :projects & :courses
fixed the navigation link to groups_path
cleaned up routes file
cleaned up groups controller
fixed the associations between :project & :course
set_current_course method redirects to groups_path

set_current_course method is in the users controller
added projects & course_projects in :groups
added cases for :group_size
attempt to merge
conflict resolution
added groups routes
Merge branch 'adding-groups-merge'