Updated ratelimit decorator on defs in common so that we're
looking for our rewritten header.
Bug fix: single link page was loading old templatetag. Removed.
Freshened up stats
Bug fix: nginx rewrites our header using the HTTP_X_FORWARDED_FOR
key instead of the X-Real-IP key
Improved wording on copy perma link text. fixes #573
Fixed link to IU logo. fixes #577
Center labels in buttons. Fixes #575
Delete .DS_Store that somehow got committed.