Group existing data and add new dataset

[chrissnyder]

• [ ] Add separate workflow for new dataset
• [ ] Ensure each group has a roughly equal number of subjects active

[chrissnyder]

@srallen The plankton data on dev is now grouped. Let me know if anything looks amiss.

[srallen]

Should I only be seeing the 'mediterranean' group at the moment?

[chrissnyder]

"mediterranean" and "original" should be live.

https://dev.zooniverse.org/projects/plankton/groups/

[srallen]

Deployed to production.