Added matplotlib_backend config option with Agg as default
Added matplotlib_backend config option with Agg as default

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