title: Cygnus subscription ngsi_version=2 not implemented
body: <p>I install the followin docker image of cygnus <a href="http://fiware-cygnus.readthedocs.io/en/latest/cygnus-common/installation_and_administration_guide/install_with_docker/index.html" rel="nofollow noreferrer">this</a>. And when i try to make a subscription like the tutorial <a href="http://fiware-cygnus.readthedocs.io/en/latest/cygnus-common/installation_and_administration_guide/management_interface_v1/index.html#section5.1" rel="nofollow noreferrer">example</a> i got the following error:</p>
  
  <pre><code>POST /v1/subscriptions&amp;ngsi_version=2 not implemented
  </code></pre>
  
  <p>This is my POST request:</p>
  
  <pre><code>{
  "subscription":{
      "description": "One subscription to rule them all",
      "subject": {
          "entities": [
              {
                  "idPattern": ".*",
                  "type": "Room"
              }
          ],
          "condition": {
              "attrs": [
                  "temperature"
              ],
              "expression": {
                    "q": "temperature&gt;40"
              }
          }
      },
      "notification": {
          "http": {
              "url": "http://localhost:5050"
          },
          "attrs": [
              "temperature",
              "humidity"
          ]
      },
      "duration": "P1M",
      "throttling": 5
  },
  "endpoint":{
      "host":"151.80.41.166",
      "port":"50001",
      "ssl":"false",
      "xauthtoken":"QsENv67AJj7blC2qJ0YvfSc5hMWYrs"
   }
  }
  </code></pre>
  
  <p>How i can enable the ngsi_version 2?</p>