Adding an adapter for memcached
I had to make minor changes to the base abstract adapter, but the changes I made should all be backwards compatibable, and won't affect other adapters.

Signed-off-by: RJ garcia <rj@bighead.net>
Update composer.json
fixing minor bugs and typos
I also did some testing on my server running memcached, and all of the methods work for the adapter

Signed-off-by: RJ garcia <rj@bighead.net>
Update composer.json
Update composer.json
Merge branch 'master' of github.com:ragboyjr/Cache into ragboyjr-master
Merge branch 'ragboyjr-master'
[Adapter] - created new adapter Memcached
[Adapter] - updated README