providing basic, ibasic and exact search to generic model fields

feature: djangoldp activity cache

Closes #266

See merge request !236

update: LDPPermissionsFilterBackend flexible with view-configured permissions

See merge request !237

replaces expensive database use

feature: LDPAPIView

Closes #282

See merge request !235

simple extension with appropriate authentication_class and dispatch headers

bugfix: reverse relations on OneToOneField in ModelSerializer

Closes djangoldp-fcpe#2

See merge request !234

bugfix (urls.py): separating imports

See merge request !232

feature: resend_activity action for Activity admin

See merge request !231

update: ViewSet perform_update and perform_create return the instance that was saved

See merge request !230

this is useful for accessing the saved object in custom post_save signals

bugfix: fix import on default template model

See merge request !229

bugfix: fix performance test runner configuration

See merge request !227

update: testing headers and removed middleware from test settings

Closes #393

See merge request !228

updated project member generation to handle differences in the test data models with the djangoldp_project production models