prepare for Django auth.Group-based classroom permissions
fix classroom permissions group post-save hook
remove django-guardian package
define permission classes
add appropriate permission classes to all detail views
add filter-based permission restrictions
update accessor permissions group names
cleanup
begin simplification of API routes
create DailyRecord model
add DailyRecord to GET/POST endpoints
add classroom daily digest endpoint
enable GET/PUT/DELETE for student subresources
enable behavior incident filtering for daily digests
bugfixes
enact permissions checking for resource POSTing
remove obsolete views
fix potential migration problem
basic student/classroom models in place, along with temporary dev scripts
move auth header injection outside of Backbone