Sign in as a different user in SharePoint 2013

Microsoft took away the menu option to Sign in as a different user.  This was invaluable to test sites to make sure everything looked right for different users or to test access.  There are a couple of ways you can still do this.  You can append this to the site address:

/_layouts/closeConnection.aspx?loginasanotheruser=true

Or you can hold down shift while right clicking the Internet Explorer option.  Then choose Run as different user.  Then navigate to the site.