Add support for cluster computing

[tiagofilipe12]

Resulting from a discussion with @thejmazz in gitter, it would be great to have support for cluster computing (such as qsub and slurm (srun and so on...)) as a plugin. It would be a matter of instead of passing bash -c "./program" pass something like qsub ..opts --cmd 'bash -c "./program" as an option for bionode-watermill (maybe with the CLI). Then some options could be added to this module where this options could be a parameter for task object (something like task.props).