Add @-ms-viewport { width: device-width } for IE10

[alexgibson]

Ref: h5bp/html5-boilerplate#1047

[AllThingsSmitty]

Tim Kadlec's recent post discusses the need for this as well with some general guidance.

http://timkadlec.com/2012/10/ie10-snap-mode-and-responsive-design/

[alexgibson]

Some interesting info here with regard to Windows Phone 8 behaviour when using width=device-width. This post makes the case that using width=320 might be a better default.

http://mattstow.com/responsive-design-in-ie10-on-windows-phone-8.html

[alexgibson]

There are some handy visuals in this post showing the effects of using @-ms-viewport {width=device-width} on WP8 devices:

http://nostrongbeliefs.com/why-i-think-we-shouldnt-use-css-viewport-in-ie10-for-now/

At this time, I don't think it is a good move to include it in MBP.