CLDIDE-1952: rework add subscription

@skabashnyuk @mshaposhnik @evoevodin @sleshchenko 
Please, review my changes
I got latest formatter from [here](https://wiki.codenvycorp.com/display/DPP/Formatting) which lets <code>.toString())); </code>  instead of 
```java
                  .toString()
));
````
</code>looks better!