Update recipe for redis 2.6 and runit
- Install from source by default because aptitude still using redis 2.2
- Remove obsolete 'vm' configuration options
- update hash-max-zipmap-* configuration options to hash-max-ziplist-*
- Switch to runit instead of init by default; it's *better*
- Use runit "default-logger" to log to /var/log/redis
- Do not daemonize when using runit; it doesn't work