Added the possibility to filter by application name in the url + modifed the name_parent's value of the ApiEndpoint

- Add link to the ''/docs/[filter_name]'' for each group.grouper (name_parent)
- Parameter in the 'docs/filter_name' now works with app_name or namespace
- WARNING: Modify the urlpatterns for django version >= 1.9 (see deprecated use of app_name : https://docs.djangoproject.com/en/1.9/ref/urls/#include)

Use of a dictionnary { serializer: fields } for recursive call of __get_fields__

Conflicts:
	rest_framework_docs/__init__.py

# Conflicts:
#	rest_framework_docs/__init__.py
#	rest_framework_docs/api_docs.py
#	rest_framework_docs/api_endpoint.py

no prefix in the callback (when is the class instance).

Fix a TypeError fetching the allowed_methods when the ModelViewSet has no prefix in the callback (when is the class instance).

# Conflicts:
#	rest_framework_docs/__init__.py
#	rest_framework_docs/api_docs.py

# Conflicts:
#	rest_framework_docs/__init__.py
#	rest_framework_docs/api_endpoint.py
#	tests/tests.py

# Conflicts:
#	demo/project/organisations/urls.py
#	rest_framework_docs/__init__.py
#	rest_framework_docs/api_docs.py
#	rest_framework_docs/api_endpoint.py
#	rest_framework_docs/templates/rest_framework_docs/home.html
#	rest_framework_docs/views.py
#	tests/tests.py
#	tests/urls.py