Disable motion detection by default on desktop

[zpao]

This isn't perfect, but it changes how Plax works by default on desktop.
Previously it would always be enabled if the browser supported it
(Firefox only?). Now it will be disabled unless you explicitly allow
desktop support. Detection is done by detecting 'ontouchstart' which is
only on mobile (for now).

[zpao]

This is causing a bad behavior with Firefox 14+ on desktop where motion detection is triggered because window.DeviceMotionEvent exists if we can use the accelerometer (may need MBP, my MBA didn't trigger). The result is a "Tatooine earthquake" on Github's 404 pages (see https://bugzilla.mozilla.org/show_bug.cgi?id=768634)

[dougt]

I'd hate to see that you can not depend on the existing of .DeviceMotionEvent. You can instead just use a low pass filter to filter out the noise.

[dougt]

Something like: https://dl.dropbox.com/u/8727858/plax_low_pass_filter.diff

[dougt]

fwiw, i created a pull request for that patch.

[cameronmcefee]

Closing since this is irrelevant to the latest version