ENH: Improve the removal of trailing whitespace
ENH: Improve the removal of trailing whitespace

Update the Makefile to add PHONY targets and
to remove trailing whitespace from both .py and .rst
files.

dgellis90/nipype,sgiavasis/nipype,mick-d/nipype,iglpdc/nipype,pearsonlab/nipype,carolFrohlich/nipype,mick-d/nipype,dgellis90/nipype,sgiavasis/nipype,carolFrohlich/nipype,sgiavasis/nipype,iglpdc/nipype,mick-d/nipype,pearsonlab/nipype,dgellis90/nipype,dgellis90/nipype,FCP-INDI/nipype,carolFrohlich/nipype,mick-d/nipype,FCP-INDI/nipype,iglpdc/nipype,FCP-INDI/nipype,FCP-INDI/nipype,carolFrohlich/nipype,iglpdc/nipype,pearsonlab/nipype,sgiavasis/nipype,pearsonlab/nipype