Speed up travis
Speed up travis

petercable/xray,drewokane/xray,markelg/xray,jhamman/xray,pydata/xarray,clarkfitzg/xray,pydata/xarray,xray/xray,kjordahl/xray,pydata/xarray,rabernat/xray,jhamman/xarray,hetland/xray,shoyer/xarray,cpaulik/xray,jhamman/xarray,markelg/xray,kjordahl/xray,cpaulik/xray,shoyer/xarray,hetland/xray,jcmgray/xarray,rabernat/xray,NicWayand/xray,chunweiyuan/xarray,shoyer/xray,markelg/xray,clarkfitzg/xray,jhamman/xarray