Added functionality for most in common contributors (most frequent collaborators)
Add test for get_most_in_common_contributors
Merge branch 'develop' of github.com:CenterForOpenScience/osf into feature/add-contrib-language
Test had a spelling error on assert
Merge branch 'develop' of github.com:CenterForOpenScience/osf into feature/add-contrib-language
flake8'ed
Merge branch 'develop' of github.com:CenterForOpenScience/osf into feature/add-contrib-language
Edit project deletioni modal to include contributor names
Edit project deletion modal to show only ten contributors.

Additional contributors are depicted by 'XX more' text.
Merge branch 'develop' of github.com:CenterForOpenScience/osf into feature/add-contrib-language

Conflicts:
	website/project/views/contributor.py
Create test for limiting number of contributors received from get_contributors
Add comments to contributor.py file to explain edits/additions
Fix test comments
Remove profile links contributor list
Deletion confirmation wording change
Remove ellipsis after others
Respond to round 1 of code review
Add tests and refactor helpers.

Test StorageFile model.
Test view file endpoint.
DRY up requests for signed URLs.
Merge branch 'develop' of https://github.com/CenterForOpenScience/osf into feature/osf-storage
Test upload file view.