Added test_data_array.test_reindex
Added test_data_array.test_reindex

Minimal, but it's better than nothing.

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