OSMF SVN

Adding inline documentation to the control bar plug-in sample.

Updating sample to have its root-element use an absolute width and height. This ensures that the control bar shows in the right position, regardless of the video content being available yet.

Tweaking sample to have the parallel element use a fixed size.

Removing debugging statements, and extending comments.

Adding copyright header.

Adding a simple layout sample that demonstrates how to position an overlay bug over a video using a parallel element.

Adding a 'smoothing' property, parallel to the one we have on VideoElement.

PARB changes: rename LayoutRendererMode to LayoutMode. Set modes to be "none", "vertical" and "horizontal". Updating units tests and client code accordingly.

PARB changes: make calculateContainerSize @private.

PARB changes: changing LayoutProperties.snapToPixel to be true by default.