Feature/community directory

Require:

• Servers upgrades
• federate commands re-run, for new endpoints
• config.json upgrade:

    {
      "type": "communities",
      "endpoints": {
        "get": "http://server/sources/communities/",
        "addresses": "http://server/sources/communitiesaddresses/",
        "uploads": "http://server/upload/"
      },
      "route": "communities"
    },

See related readme