Exclude test run with pydap on Python 3.3
Exclude test run with pydap on Python 3.3

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