Initial version for code review

Because the initial development was occurring on master, there isn't an easy way to do code review. This pull exists solely as a means to code review the entire project. Any changes will be put straight into master and this pull will be closed and the `initial-code-review` branch deleted. All future development will use pull requests into master to facilitate code review.
`new Memcache($memcache)`  is confusing, maybe you should include the full namespace here.

So `\Memcache` is the Matroyshka class and `Memcache` is the actual extension class?