Implementation for Redis Cache Storage

 Greetings!

I have implemented a cache handler for Redis storage. It uses PHP Redis extension or Predis PEAR package if any of these are available. It also adds 2 global configuration options for Redis Host IP/Socket and Redis Port.

Only had a chance to test on Windows.

References:
Predis: https://github.com/nrk/predis
PHP Redis Extension: https://github.com/nicolasff/phpredis

JoomlaCode Tracker: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=32099&start=0

(updated by brian with the corrected tracker link)