- Allow users to run regular relays. In addition to that users will be
able to turn them into bridge relays. Like before, by default,
relaying is enabled and the relay type bridge relay.
- Show obfs3/4 transport ports as needing firewall port forwarding only
if bridge relay is enabled.
- Remove pluggable transports configuration from configuration when
bridge rely is disabled.
- Improve description message for relays and bridge relays.
- adapted all modules to not use views.ConfigurationView anymore
- removed templates that are not needed anymore
- no more implicit 'enabled' and 'get_status' functions in __init__.py files
- (more coherent/explicit use of Django functionality)
