Just pushed Redis persistence

[Jeff Lindsay]

Previously, all bins were stored in memory. Every night, Heroku would restart the process. So bins could only last about 24 hours max.

Now, finally, there is a Redis storage backend that it uses on Heroku. So bins will now expire 48 hours after creating them, as originally intended. 

Next will be to come up with a way to allow for longer lived bins without new messy UI options while maintaining the self-cleaning storage. 

Perhaps we extend expiration with every visit to ?inspect...

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Jeff Lindsay
http://progrium.com