Finished processing of visibility array.
Updated xml3d.js script.
Added propagation of perspective projection from AR operator to view element.

Reduced code amount.
Added new AR example.
Updated image processing examples to the latest version of xml3d.js.
Added minimal AR example.
Simplified ar_simple.xhtml example.
Changed simple AR example to use XML3DDataObserver.
Added RiverTrail Sepia Video example.
Added additional image processing examples.
Separates Rivertrail Examples + Gaussian Filter with RiverTrail
Updated xml3d.js script.
Updated ar_simple.xhtml for latest xml3d.js.
Updated flying teapot demo.
Renamed flying teapot example to ar_flying_teapot.xhtml.
Added image processing example with xflowip library
Updated xflow ip library
Updated examples for xflowimg
Added example without flipping of the Webcam image.

ARMarkerDetector operator supports now optional noflip parameter which
produces marker transformations for non-flipped Webcam image.
Added test AR video.

Dmitri playing with a Teapot :)