add kraken to roary

[erinyoung]

Roary has this cool optional QC feature that uses kraken to determines what organism each gff file has.

Except... this means that the container needs kraken, which the current container does not have.

The container does create a /kraken_db directory, though.

[kapsakcj]

sure, we can get that added. Lots of copy/paste from here, I think https://github.com/StaPH-B/docker-builds/blob/master/kraken/1.1.1-no-db/Dockerfile

I thought there was a binary, but looks like I'm mistaken. We'll probably have to build kraken from source

[erinyoung]

I think the container that @kapsakcj created in #260 will be good enough to cover this.

Thank you @kapsakcj !

[kapsakcj]

kraken1 has been added to roary 3.13.0 docker image in #260

updating docker images on dockerhub and quay: staphb/roary:3.13.0 and staphb/roary:latest