Let nipype work with python 2.6 again
Let nipype work with python 2.6 again

This file runs even when importing nipype.interfaces.io, hence make
nipype unsuable without python 2.7

gerddie/nipype,FCP-INDI/nipype,wanderine/nipype,Leoniela/nipype,sgiavasis/nipype,grlee77/nipype,carolFrohlich/nipype,gerddie/nipype,JohnGriffiths/nipype,dmordom/nipype,blakedewey/nipype,fprados/nipype,carolFrohlich/nipype,carolFrohlich/nipype,rameshvs/nipype,FCP-INDI/nipype,iglpdc/nipype,blakedewey/nipype,grlee77/nipype,dgellis90/nipype,arokem/nipype,glatard/nipype,mick-d/nipype,sgiavasis/nipype,rameshvs/nipype,grlee77/nipype,JohnGriffiths/nipype,dmordom/nipype,arokem/nipype,carlohamalainen/nipype,glatard/nipype,dgellis90/nipype,mick-d/nipype_source,mick-d/nipype_source,dmordom/nipype,dgellis90/nipype,pearsonlab/nipype,blakedewey/nipype,blakedewey/nipype,fprados/nipype,wanderine/nipype,JohnGriffiths/nipype,dgellis90/nipype,pearsonlab/nipype,rameshvs/nipype,gerddie/nipype,glatard/nipype,FredLoney/nipype,FCP-INDI/nipype,carlohamalainen/nipype,FredLoney/nipype,rameshvs/nipype,mick-d/nipype_source,iglpdc/nipype,sgiavasis/nipype,mick-d/nipype,iglpdc/nipype,FredLoney/nipype,mick-d/nipype,grlee77/nipype,mick-d/nipype,pearsonlab/nipype,carlohamalainen/nipype,JohnGriffiths/nipype,wanderine/nipype,Leoniela/nipype,arokem/nipype,Leoniela/nipype,glatard/nipype,fprados/nipype,carolFrohlich/nipype,sgiavasis/nipype,FCP-INDI/nipype,pearsonlab/nipype,arokem/nipype,wanderine/nipype,gerddie/nipype,iglpdc/nipype