Use slug for favorites naming
Use slug for favorites naming

- Keeps collection name unique, but is more descriptive
- Closes #1357

amyrebecca/Panoptes-Front-End,CKrawczyk/Panoptes-Front-End,amyrebecca/Panoptes-Front-End,alexbfree/Panoptes-Front-End,fmnhExhibits/Panoptes-Front-End,edpaget/Panoptes-Front-End,mrniaboc/Panoptes-Front-End,fmnhExhibits/Panoptes-Front-End,CKrawczyk/Panoptes-Front-End,jelliotartz/Panoptes-Front-End,camallen/Panoptes-Front-End,CKrawczyk/Panoptes-Front-End,mrniaboc/Panoptes-Front-End,jelliotartz/Panoptes-Front-End,alexbfree/Panoptes-Front-End,fmnhExhibits/Panoptes-Front-End,parrish/Panoptes-Front-End,edpaget/Panoptes-Front-End,alexbfree/Panoptes-Front-End,edpaget/Panoptes-Front-End,amyrebecca/Panoptes-Front-End,mrniaboc/Panoptes-Front-End,camallen/Panoptes-Front-End,camallen/Panoptes-Front-End,zooniverse/Panoptes-Front-End,parrish/Panoptes-Front-End,parrish/Panoptes-Front-End,jelliotartz/Panoptes-Front-End