Switching to device-width for the @-ms-viewport rule and using Microsoft's suggested fix for the Windows Phone 8 bug, See http://timkadlec.com/2013/01/windows-phone-8-and-device-width/

git-svn-id: https://plugins.svn.wordpress.org/mp6/trunk@800587 b8457f37-d9ea-0310-8a92-e5e31aec5664