Set password value and expiration atomically
Set password value and expiration atomically

Redis has a `SETEX` (http://redis.io/commands/SETEX) method,
which does both setting the value and setting the expiration
atomically.

samteezy/snappass-heroku,frontfoot/snappass,frontfoot/snappass,frontfoot/snappass,pinterest/snappass,pinterest/snappass,samteezy/snappass-heroku,pinterest/snappass,samteezy/snappass-heroku