ENH: travis -- add a run which would execute with DUECREDIT_ENABLE
ENH: travis -- add a run which would execute with DUECREDIT_ENABLE

carolFrohlich/nipype,carolFrohlich/nipype,mick-d/nipype,mick-d/nipype,mick-d/nipype,carolFrohlich/nipype,mick-d/nipype,carolFrohlich/nipype