Key
 . = still to do
 - = discarded
 * = completed

* get rid of MooseX::Privacy to speed things up somewhat
* improve error message when expression is unparsable
. clean up tests and add more thorough testing
* allow attribute selectors as well as predicates
* figure out odd warning being emitted by demo code
* add wrap method to forester for use in coercion
* add tag method to forester to reduce coding burden for most adaptations
