Added input and output specifications to interfaces.common module's init.
Added input and output specifications to interfaces.common module's init.

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