ENH: Add progressbar for quantopian-quandl download.
ENH: Add progressbar for quantopian-quandl download.

quantopian/zipline,alphaBenj/zipline,enigmampc/catalyst,Scapogo/zipline,enigmampc/catalyst,florentchandelier/zipline,humdings/zipline,bartosh/zipline,umuzungu/zipline,umuzungu/zipline,bartosh/zipline,magne-max/zipline-ja,magne-max/zipline-ja,quantopian/zipline,alphaBenj/zipline,Scapogo/zipline,humdings/zipline,wilsonkichoi/zipline,wilsonkichoi/zipline,florentchandelier/zipline