fix server box model unit test
added test for recurly url method on user model
add getSubscriptionAdminURL to User model
add /api/:username/subscription/billing API endpoint to redirect users to Recurly hosted admin page
add link to user menu allowing customers to edit their billing details
Fat arrow fix.
Update Mac instructions
Merge pull request #547 from scraperwiki/20140312-recurly-admin

Allow paying users to administer their own Recurly account
Adds accountLevel (ugly) in the nav