Kraken API Support

[wmbest2]

Would be nice to be able to run generated images through the kraken API via a flag or key

e.g.

res-gen {
    krackenioApiKey "my key"
}

[nick-fedesna]

ooh, but maybe it should be:

resgen {
    releaseTheKracken "my key"
}

I actually think this might be better suited as a separate library since we would want to run it on all assets, not necessarily just those generated by ResGen. That being said, there maybe already is something out there? Worth looking into that first at least.