Heroku changes.
Always use warc archive; remove USE_WARC_ARCHIVE flag.
Fix media/static assets in debug+mirror mode.
Tweak zip file layout for mirrored assets.
Fix tests for mirroring app.
Update celery docs.
Fix imports.
Use Vagrant Cloud to link to vm.
Remove .DS_store somehow added to git.
Fix Travis settings.
Don't print coveralls debug for travis.
Improved wording on copy perma link text. fixes #573
Fixed link to IU logo. fixes #577
Center labels in buttons. Fixes #575
Merge branch 'dev.heroku3' of https://github.com/jcushman/perma into jcushman-dev.heroku3
Delete .DS_Store that somehow got committed.
Removed crufty .DS_Store
Merge branch 'develop' of github.com:harvard-lil/perma into develop
Add supporting partners section, revise supporting institutions.
Merge pull request #579 from jcushman/partners4

Add supporting partners section, revise supporting institutions.
Use requests to check iframe-ability.

Fixes #576