Mailing Lists

Combination of #1 #2 #3 also contains the fixes of #1



<!---
@huboard:{"custom_state":"ready"}
-->

I think it is still faster to do both request at the same time and then wait for them to end. Basically `combineRegister` acts like a guard where it needs both callback to finish to perform the action. 
I could have used `_.after (2,..)` to have the same behavior