Bug 197228 Need updaet createdBy info when serialize the module
When open module, designer will pass the property map which contains the createdBy info. this info should be retained by moduleHandle and then be updated and written when doing serialization. Note if this info is null, model should not update it during serialization. This could happen for api users or third-party designer. For BIRT designer, it will guarantee this value always not null.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
* Broadcasts the dispose event to the dispose listeners.
	 * 
	 * @param event
	 *            the dispose event
	 */
	public void broadcastDisposeEvent( DisposeEvent event )
	{
		if ( disposeListeners == null || disposeListeners.isEmpty( ) )
			return;
		List temp = new ArrayList( disposeListeners );
		Iterator iter = temp.iterator( );
		while ( iter.hasNext( ) )
		{
			IDisposeListener listener = (IDisposeListener) iter.next( );
			listener.moduleDisposed( (ModuleHandle) getHandle( this ), event );
		}
	}
	/**
	 * Broadcasts the resource change event to the resource change listeners.
	 * 
	 * @param event
	 *            the dispose event
	 */
	public void broadcastResourceChangeEvent( ResourceChangeEvent event )
	{
		if ( resourceChangeListeners == null
				|| resourceChangeListeners.isEmpty( ) )
			return;
		List temp = new ArrayList( resourceChangeListeners );
		Iterator iter = temp.iterator( );