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.
It's only public in `Scope` so this class can retrieve it. =(

[Friend classes](http://en.wikipedia.org/wiki/Friend_class) or package protected would be nice but they aren't available in PHP.