Pick otus

The qiita_ware part is done. I'm only missing connecting it with the interface. https://github.com/biocore/qiita/pull/731 should be merged before this PR is merged (it is build on top of it)
Not needed. I'm already working on it. And the issue is something that is going to be changing on time as we accept more parameters. E.g. what I'm working right now is to change the reference used, but probably in 1 month we allow other changes. Does that makes sense?