Merge branch 'crossDomain' of https://github.com/JessThrysoee/jquery into JessThrysoee-crossDomain

src/ajax.js

@@ -604,7 +604,7 @@ jQuery.extend({
 		s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( rspacesAjax );
 
 		// Determine if a cross-domain request is in order
-		if ( !s.crossDomain ) {
+		if ( s.crossDomain == null ) {
 			parts = rurl.exec( s.url.toLowerCase() );
 			s.crossDomain = !!( parts &&
 				( parts[ 1 ] != ajaxLocParts[ 1 ] || parts[ 2 ] != ajaxLocParts[ 2 ] ||