ENH: Adds wrappings for registration FS commands.
ENH: Adds wrappings for registration FS commands.

These commands include:
"mpr2mni305"
"avi2talxfm"
'mri_em_register
'mris_register'
'mrisp_paint'

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