Some tests rely on a running memcached server

[adampetro]

In #13, I added CI, but had to ignore a few tests because they rely on a running memcached server. We should remove the ignore somehow. There's probably a few ways to do it, either changing the test to use some sort of mock or stub, or we could move them to the tests/ directory and make them more integration-style and add a running memcached server to CI and local development.