Detach ip address from nic (#480)

* Added method to handle ip address detachment

Co-authored-by: Tim Green <tim.green@ukfast.co.uk>

Author: rawveg

src/eCloud/NicClient.php

@@ -33,7 +33,7 @@ public function loadEntity($data)
             $this->apiToFriendly($data, $this->getEntityMap())
         );
     }
-  
+
     /**
      * Assigns an IP address with a NIC
      * @param $id
@@ -48,7 +48,19 @@ public function assignIpAddress($id, $ipAddressId)
         );
         return $response->getStatusCode() == 202;
     }
-  
+
+    /**
+     * Detaches an IP address from a NIC
+     * @param $id
+     * @param $ipAddressId
+     * @return bool
+     */
+    public function detachIpAddress($id, $ipAddressId)
+    {
+        $response = $this->delete($this->collectionPath . '/' . $id . '/ip-addresses/' . $ipAddressId);
+        return $response->getStatusCode() == 202;
+    }
+
     /**
      * Get the IP address records associated with a NIC
      * @param $id