Added flake8 F401 ignore for init files.
Added flake8 F401 ignore for init files.

oesteban/mriqc,poldracklab/mriqc,poldracklab/mriqc,oesteban/mriqc,poldracklab/mriqc,oesteban/mriqc,poldracklab/mriqc,oesteban/mriqc