Added Quandl as a source to the HistoricalDataBroker.
Added Quandl as a source to the HistoricalDataBroker.

qusma/qdms,qusma/qdms,KBurov/qdms,Jumaga2015/qdms,leo90skk/qdms,underwater/qdms,leo90skk/qdms,underwater/qdms