Add download counts to daily report.
Merge branch 'master' of https://github.com/CenterForOpenScience/osf.io
Must initialize app for URL building to work.
Handle null download counts.
Merge branch 'hotfix/0.21.40'
Merge branch 'master' into release/0.22.0
Merge branch 'samanehsan-feature/mailchimp' into release/0.22.0
Handle when user.mailing_lists is None
Update changelog

[skip ci]
Add the ability to disable user accounts

Conflicts:
	framework/auth/views.py
	website/profile/views.py
Refactor User.is_active() to a property method
Merge branch 'samanehsan-feature/mailchimp' into release/0.22.0
Set ENABLE_EMAIL_SUBSCRIPTIONS to false by default

Also raise 400 error in user_notifications
view function if ENABLE_EMAIL_SUBSCRIPTIONS is
False.
Set ENABLE_EMAIL_SUBSCRIPTIONS to False in OsfTestCase class

Prevent real calls to the mailchimp api by setting
ENABLE_EMAIL_SUBSCRIPTIONS to False in the OsfTestCase
class.