Version 0.4.0 Beta!
* Added `MyClass._PARENT` to refer to the parent class.
* Added `ClassInstance.super()` to call a method on the parent class, despite it being
  overridden in the class that `super` is called on.
* Added `ClassInstance.getStatic()` to find a property in the static parent chain.
* Added `ClassInstance.callStatic()` to call a method in the static parent chain.
* Updated the minified version.