[Fix bug 937699] Remove fixture dependencies from /events tests
* Add factories for the rest of event's models
* Add factories for the rest of profile's models
* Add missing docstrings in model factories
* Stop using test_utils.TestCase
* Make tests more atomic/isolated
* Use model factories to create test data
[Fix bug 937705] Remove fixture dependencies from /profiles tests
* Stop using test_utils.TestCase
* Make tests more atomic/isolated
* Use model factories to create test data