Add Centrifuge and metaPhlan2

[Merritt-Brian]

Description of feature

Adding 2 classifier approaches

Centrifuge and metaPhlan2

[Merritt-Brian]

metaPhlan does not generated classified/unclassified fastq file as an optional output. Use either awk or bioconda (python script) to filter out only reads that align to the hits. You'll need to import the classifier outfile from metaPhlan to figure out what reads classified vs didn't

[erinyoung]

It would be great to have a classifier that's built for nanopore reads (or other long-read sequencing methods) like spumoni. Kraken2 can have issues with nanopore's higher error rates.