faces 6.x-1.0-beta1

changes since ALPHA-1:

* overhauled the API to instantiate class extenders. That way we won't run into troubles with late static binding of PHP <5.3, can properly implement the interface in extenders and extenders can make use of per extendable object variables.
However to ease explicit invocation of specific extenders an extender() method has been added to the faces extendable.
Also a test case for easy benchmarking of faces has been added and extending single methods without an interface is possible with functions now.

* improved facesAs() to correctly work when testing for a parent interface
* updated / improved README
* conditionally load classes to be more robust in case of multiple file inclusions
* just make property() public, thus remove FacesRoot
* fixing warning in property() when the property is non existing