Some Features

Hi, attached is a pull request with two changes:

1) Improvements to Uptime calculation. Uses gmdate() to avoid timezone offsets and displays the number of days along with the time, if applicable.

2) Wraps the actual memcached interactions in a driver-agnostic class. Here at 383 we typically use the "memcache" driver for PHP, instead of the alternative "memcached" one (confusing I know).

Hopefully they help.