expose the Community in the API

[pspdbx]

Hello,

Thank you for the awesome work with this plugin! Please expose the Community model in the api. I'm using version 0.3.1 and looks like only routing_policy, asn and session are exposed in the api.

{"asn":"<uri>/api/plugins/bgp/asn/?format=json","session":"<uri>/api/plugins/bgp/session/?format=json","routing_policy":"<uri>/api/plugins/bgp/routing_policy/?format=json"}