Fix several cases of assuming that a Profile always has a numeric ID, rather than a named key, which is untrue.

api.py

@@ -228,7 +228,7 @@ class APIWrapper(webapp2.RequestHandler):
   @session.session_required
   def post(self):
     profile_str = str(
-        models.Client.profile.get_value_for_datastore(self.client).id())
+        models.Client.profile.get_value_for_datastore(self.client).id_or_name())
     ret = {
         'status': 'ok',
         'profile': profile_str,