Version 2

A refactoring of the internals to make things a bit cleaner, and some external improvements as well.

Big change is this release:

Properties that don't exist now return null, not false!

This has been changed to better reflect that

1. They don't exist (which is...what null means)
2. Sometimes the value you want is false

Given PHP's weak typing you may not need to update previous code that uses the earlier version, but it never hurts to be careful.