Mark as xfail if Python 2.7 and 3.3 are not installed
Mark as xfail if Python 2.7 and 3.3 are not installed

spacetelescope/asv,airspeed-velocity/asv,giltis/asv,edisongustavo/asv,mdboom/asv,edisongustavo/asv,pv/asv,waylonflinn/asv,spacetelescope/asv,spacetelescope/asv,waylonflinn/asv,giltis/asv,ericdill/asv,mdboom/asv,ericdill/asv,pv/asv,pv/asv,qwhelan/asv,mdboom/asv,airspeed-velocity/asv,airspeed-velocity/asv,ericdill/asv,qwhelan/asv,airspeed-velocity/asv,waylonflinn/asv,qwhelan/asv,qwhelan/asv,edisongustavo/asv,ericdill/asv,spacetelescope/asv,giltis/asv,mdboom/asv,pv/asv