* enh: added voxel displacement maps, support for afni
* enh: added voxel displacement maps, support for afni

* sty: some pep8 cleanup
* fix: convert nipy motion parameters to matrix using nipy
* api: added option to use particular threshold when creating brain mask internally
* enh: save mask used for global signal calculation

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