added the key 'add_roles_in_sequence' as a
	'build_class' argument to allow for one role to
	'require' a method from another role
	see POD for more explanation
added a method to manage behaviour of resetting or
	re-use of Moose Classes built with a duplicate
	'package' name.  The default is to overwrite
	with a warning.
Improved POD definitions of the global variables used.