Add itersource test.
Add itersource test.

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