added memcached kvstore backend
made memcached dependency optional
made memcached backend create a new client per connect() call
fixed memcached backend delete() name and moved connect()
i am semicolon blind
Merge pull request #3 from dannycoates/memcached

Memcached kvstore backend
Implement create, startLogin, and finishLogin sans SRP
Add failure test cases
Merge pull request #4 from mozilla/accounts

Implement create, startLogin, and finishLogin sans SRP