Allow admins to view past-due subscriptions.
Some refactoring of displayed of past-due subscriptions.
And removing comment..
Fix typo in test name.
Minor tweaks.
Consider pending & past due subscriptions as 'active' in the sense that they should prevent one from adding a new subscription.
Merge branch 'develop' into feature/billing-past-due-subscriptions
Admins can cancel pastdue subscriptions, but users cannot cancel their own pastdue subscription, as then admins won't be able to search for them.
Add permissions to subscriptions index, and fix test to stub the subscription's balance.
Some cleanup of code to deal with past due subscriptions.
Merge pull request #98 from jessib/feature/billing-past-due-subscriptions

Feature/billing past due subscriptions