fix disasters ui notifications

Author: William Hou

SingularityUI/app/reducers/api/index.es6

@@ -1,6 +1,5 @@
 import _ from 'underscore';
 import { combineReducers } from 'redux';
-import Messenger from 'messenger';
 import buildApiActionReducer from './base';
 import buildKeyedApiActionReducer from './keyed';