Shopify/identity_cache — pull request #90 by arthurnn (2013-09-17 20:11:37+00:00)
Title: Add memcached adapter

In order to support the `CAS` operations we will have to stop using the ActiveSupport Cache class and create our own adapter. This is the memcached adapter with the interface we will need for the CAS/ADD changes.

This PR doesn't affect any running code, it is just the adapter with tests, but so far nobody is calling it.

review @camilo @fbogsany
cc @hornairs @tobi