Get browser version rather than rendering engine version.

Don't recognize Chrome as Safari.
See results of different userAgent strings here:
http://spreadsheets.google.com/ccc?key=0Aj5JJFjq9rZDdHdxXzRLVnY0SzFpRTBOUDc4VmhzRVE

src/core.js

@@ -624,8 +624,8 @@ jQuery.extend({
 	// It's included for backwards compatibility and plugins,
 	// although they should work to migrate away.
 	browser: {
-		version: (/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/.exec(userAgent) || [0,'0'])[1],
-		safari: /webkit/.test( userAgent ),
+		version: (/.*?(?:firefox|safari|opera|msie)[\/ ]([\d.]+)/.exec(userAgent) || [0,'0'])[1],
+		safari: /safari/.test( userAgent ),
 		opera: /opera/.test( userAgent ),
 		msie: /msie/.test( userAgent ) && !/opera/.test( userAgent ),
 		mozilla: /mozilla/.test( userAgent ) && !/(compatible|webkit)/.test( userAgent )