Log Message:
Updated p5-Business-ISBN to 2.011.

2.011 2016-06-07T18:20:50Z
	* bump to stable release

2.010_01 2016-03-28T03:45:17Z
	* Had error_* methods to get the error text and check the error
	conditions so you don't have to use %ERROR_TEXT or the constants.
	* Deprecate the xisbn stuff. It's still there, but it should have
	disappeared about two weeks ago.
	* Add an example of inserting an unofficial group code for the
	Blake and Taylor shenanigans.