Adding feature to figure the reverse dependencies of roles

[nfelsen]

Thanks for making ansigenome, among other things, I love the export feature.

I added an option to list reverse dependencies of roles.
I use that when making changes in ansible role(s) to see which role could possibly be impacted by the change

[ypid]

@nfelsen Thanks very much. Looks interesting. @nickjj this basically adds a new function to ansigenome. I think merging is safe else merge conflicts might increases later.

[nickjj]

Thanks for the contribution. This does look interesting but I'm having trouble visualizing what this command produces.

I vaguely remember being able to flip dependencies around in the graph config with a 1 line change. For example if you look at the graph in the readme, it would put ferm on the bottom instead. Does this do something much different?

Lastly, would you mind updating the readme with information about the new command? Mainly the quickstart section.