Add creatorId attribute to Room class

Add new Spark room attribute creatorId to Room class.

Author: cmlccie

ciscosparkapi/api/rooms.py

@@ -53,6 +53,10 @@ def lastActivity(self):
     def created(self):
         return self._json[u'created']
 
+    @property
+    def creatorId(self):
+        return self._json[u'creatorId']
+
     @property
     def teamId(self):
         """Return the room teamId, if it exists, otherwise return None.
@@ -78,7 +82,7 @@ class RoomsAPI(object):
     """
 
     def __init__(self, session):
-        """Init a new RoomAPI object with the provided RestSession.
+        """Init a new RoomsAPI object with the provided RestSession.
 
         Args:
             session(RestSession): The RESTful session object to be used for