Added the ability to override ->agent->is_mobile using the querystring parameter ?mobile_override using an immediately expiring cookie so the site will go back to rending in mobile after the browser has been closed and re-opened
Made the cookie hostname work for any domain
Remove copied code in MY_User_Agent, rather just pass the control back to the original function
Merge pull request #3274 from bloveless/2.3/develop

Added the ability to override $this->agent->is_mobile()