Release v0.9.4
Release v0.9.4

shoyer/xarray,jhamman/xarray,jhamman/xray,jhamman/xarray,rabernat/xray,chunweiyuan/xarray,markelg/xray,shoyer/xray,markelg/xray,pydata/xarray,jcmgray/xarray,pydata/xarray,jhamman/xarray,markelg/xray,shoyer/xarray,pydata/xarray,xray/xray,rabernat/xray