OSMF SVN

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.

Adding missing TestVerticalAlign and TestHorizontalAlign classes.

PARB changes: splitting layout alignment property into verticalAlign, and horizontalAlign. Removing registrationPoint property, and its enumeration class. Adding VerticalAlign, and HorizontalAlign enumeration classes, and updating unit tests and client code accordingly.