Do not force trailing slash

Leave the ability to specify the use of trailing slash to dev rather than enforce the /{f}/ pattern

If dev specifies his patterns as such:
  
    url(r'^v1/subnets$', SubnetCollection.as_view()),
    url(r'^v1/subnets/(?P<idSubnet>[\d\w]+)$', SubnetResource.as_view()),

And he visits the generated doc @ http://localhost:8000/docs/#!/subnets

The /v1/subnets gets forcefully omitted from the apis and therefore not displayed.