Bug 183733 Implement the IScriptOjectClassInfo to provide the class infromation to support the JS code assistant.
Engine should implement the IScriptObjectClassInfo interface to return the class information for script object.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/ExecutionContext.java
* get the report engine. In that engine, we create the context.
	 * 
	 * @return the report engine used to create the context.
	 */
	public IReportEngine getEngine( )
	{
		return engine;
	}
	/**
	 * Clean up the execution context before finishing using it
	 */
	public void close( )
	{
		scriptContext.exit( );
		if ( dataSource != null )
		{
			try
			{
				dataSource.close( );
			}
			catch ( IOException e )
			{
				log.log( Level.SEVERE, "Failed to close the data source", e );
			}
			dataSource = null;
		}
		if ( dataEngine != null )
		{
			dataEngine.shutdown( );
			dataEngine = null;