Add memcached AS store
Force exist? method to return a bool
Force key to ASCII 8BIT

Rails 4 dalli implementation forces the encode of the key.
Require all AS
Make Gemfile work with multiple versions
Make MemcachedSnappyStore use MemcachedStore
Remove memcache-client as we dont need it anymore
Remove some comments
More comments
Add multiple AS versions to travis
Allow failure on rails master

And not on ruby 2.1.0
Merge pull request #4 from Shopify/memcached_store

Memcached store