Add support for regex in consent.disable

Add support for regular expressions in consent.disable to make it easy to disable consent requirement for an entire domain or for trusted domains.  We have over 100 SP defines internally and would like to have consent disabled for all of them easily and without having to update the IDP metadata each time we add a new SP.

Example consent.disable in IDP metadata :
	// Disable consent for our SPs
	'consent.disable' => array(
		'https://mysp.mypartner.com',
		array('type'=>'regex', 'pattern'=>'/.*\.mycompany\.com.*/i'),
	),