Move submission set count and place count from the views to the serializers

Conflicts:
	src/sa_api_v2/serializers.py
	src/sa_api_v2/views/base_views.py
Add ApiKey serializer

Conflicts:
	src/sa_api_v2/serializers.py
Dataset key updates
- Add keys to the serialized datasets
- Disabled caching on dataset views and serializers
- Update permission so that only logged in owners can access through the api
- Update tests accordingly

Conflicts:
	src/sa_api_v2/serializers.py
	src/sa_api_v2/tests/test_serializers.py
	src/sa_api_v2/tests/test_views.py
	src/sa_api_v2/views/base_views.py
Automatically create a new apikey when creating a new dataset via the api