removing $.browser ...

since it has been removed as of jquery 1.9 (http://jquery.com/upgrade-guide/1.9/).

Also it appears the logic to use $.browser is no longer needed since it appears it was used as a workaround to this bug (http://bugs.jquery.com/ticket/6446) which has since been fixed.

Additionally, removing the check for opera and consequential hiding on line 227 did not cause any visible issues on my opera tests, but perhaps I am not using the right version of opera?