OSMF SVN

PARB feedback: rename LayoutProperties to LayoutRendererProperties.

PARB feedback: rename LayoutRenderer to LayoutRendererBase, rename DefaultLayoutRenderer to LayoutRenderer.

Updating source path to control bar plugin.

Moving ControlBarPluginSample and Test into the plug-ins folder.

PARB feedback: taking out 'media' references; renaming measureMedia to measure, and updateMediaDisplay to layout.

PARB feedback: updating sample to use measureWidth and height.

PARB feedback: renaming LayoutRenderer.targets to hasTarget.

PARB feedback: adding ASDocs to LayoutRenderer.measuredWidth and height properties.

PARB feedback: change mediaWidth and mediaHeight properties on layout renderer related classes to measuredWidth, and measuredHeight.

PARB feedback: change LayoutRenderer.context to container, and making adding a @private tag to the subclass stubs' ASDocs.