App.um.wes: fire events only if they were not handeled here

Signed-off-by: Oleg Verych <olecom@gmail.com>
wes4store: server push / server side events for `Ext.data.store`

UI usage:
```js
    store = Ext.create(Ext.data.ArrayStore,{
        storeId: 'lftpd',
        listeners:{
            wes4store: function (data){  }
        }
    })
```
backend:
```js
    api.wes.broadcast('wes4store',{ store:'lftpd', data:[1,2,3]})
```

Signed-off-by: Oleg Verych <olecom@gmail.com>