BLD: Only build master on appveyor (and hopefully PRs too)
BLD: Only build master on appveyor (and hopefully PRs too)

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