* Added isMasquerading() method for checking the current instance.  
* Updated to fix the getAttribute() inconsistency.  
* Expanded getAttribute() to now use an overridable attribute array for deeper testing.
* Added setAttributes( array $attr ) for providing a means to set user attributes when masquerading.
* Additional logging added for debug.
* hasAttribute($key) now available and switches checks between local and phpCAS attributes based on masquerading condition.
* Cleaned docs for typos and missing documentation.