TileStache/TileStache — pull request #198 by wilsaj (2014-10-29 23:19:41+00:00)
Title: enable "cache lifespan" in Redis cache

Using SET EX

For reference:
- http://redis.io/commands/set
- https://github.com/andymccurdy/redis-py/blob/master/redis/client.py#L1024