implement delete API in SubjectDetail
implement delete functionality in ng-app for Subject
add subject and sample count to SubjectGroupSerializer
implement delete API in SubjectGroupDetail
implement delete functionality in ng-app for SubjectGroup
BUGFIX: reload projects and get current project from stateParams when user refreshes page...currently implemented in SubjectGroup need to add to other controllers
BUGFIX: don't specify MainController in directive...it ends up getting called twice