DeviceOrientation worked example

Hi,

I've prepared a worked example for the DeviceOrientation spec, showing
how to determine which way a device is facing from the
DeviceOrientation data. See ACTION-79 [1].

I've used MathML to format the maths, but wanted to check that it's OK
to use this in the spec before I commit it. Matt, do you know? If I
don't hear back, I'll go ahead and commit it. We can always later
switch to a different format if required for publication.

A patch is attached.

Thanks,
Steve

[1] http://www.w3.org/2008/geolocation/track/actions/79

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