Start refactoring RoomSettings

- Don't manipulate settings in RoomView. Make it RoomSettings' job.
- Return Promise[] from AliasSettings.save() rather than an allSettled promise
  so callers can have more granularity over what to do with it (.all vs .allSettled)
- General refactoring of RoomSettings. Most things are broken now and are not
  submitted. Add util methods to grab values out of events.

src/components/views/room_settings/AliasSettings.js

@@ -114,7 +114,7 @@ module.exports = React.createClass({
             }
         }
 
-        return q.allSettled(promises);
+        return promises;
     },
 
     aliasEventsToDictionary: function(aliasEvents) { // m.room.alias events