Polish exchange rates module

Do not insert blank rows when we dont have data
-and-
Use Oanda's fixed IP web service.

Change-Id: Idc8770d0c87c8375f2731fdc2002f7342665cccf
Merge "Polish exchange rates module"
Merge remote-tracking branch 'origin/master' into deployment

* origin/master:
  Polish exchange rates module

Change-Id: Ie9d9aea51ead52ba0a3a5cb966bddad91e1e285c