Add stats via redis or memcached

[taoeffect]

It'd be nice to know:

• How many requests are served in a 24 hour period
• Requests/sec
• Error rate
• Country of origin (of course we won't store the IP, just the result of an IP2loc mapping).

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[taoeffect]

See also: https://github.com/bluesmoon/node-geoip