Fixed data import for student groups
Change StudentGroup subtypes to JCR/Departmental
Add Zone to StudentGroup
Student groups controller
Removed old model controllers and views
StudentGroup controller, views, tests
Remove unused fixture
Added StudentGroupKind with many-to-many on StudentGroup
Querying of student groups updated
Removed unused fixture
Updated group import
Filtering/Browsing of Student Groups
Modified behaviour of type links to filter societies browser
Improved style of societies blocks
Authorize resource on StudentGroupKind controller
Tests for StudentGroupKind controller