Plain whitespace formatting
Implemented 'resizable' logic into the pivotviewer:

 - NOTE: currently only the grid view (the other views are broken as they expect a value, but are getting a function)
 - Pass a delegate function that will be executed when either the height or width is needed
 - Moved some 'resizing' logic into css (css handles this better, but some basic sizing is still needed - see ResizeView in pivotviewer.js)
 - preview.htm now uses resizeEnd to buffer the resizes before firing the 'refresh' method on the control