rename to avoid conflict with opscode memcached

Imagine someone includes a cookbooks that `dependes "memcached"` which is actually your memcached, not the opscode memcached and the just happily deploys, without adding a github dependency, they will end up with causing a explosion at best, some misconfigured/wrong memcached at worst.
Renaming would solve this, the name is not very original but pretty unique :)