Set 'daemonize' = 'yes' by default

Update tests and README accordingly
Rename service 'redis' to 'redis-server'

Fixes #4 & #6
Update to latest Bugfix version

See https://raw.github.com/antirez/redis/2.4/00-RELEASENOTES for all details

Because 'New Redis users should use 2.6 instead.' this is a first step in converting the cookbook to 2.6.
Update SHA1 Checksum for version 2.4.18