Added Mobile Theme

[Guinness]

I've added a mobile theme and a mod which should detect most common mobile browsers and present a somewhat slimmed down experience. Please alert me if you see any issues with this.

PCs and most if not all tablets shouldn't see this experience at all.

If you prefer to use your normal theme there will be a link at the bottom for the full site.

[snip]

Working for my phone. Nice addition!