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
* @return a set of data sources
		 */
		public Object getDataSources( )
		{
			return scriptContext.eval( "design.dataSources" );
		}
		/**
		 * @return a map of name/value pairs for all the configuration variables
		 */
		public Map getConfig( )
		{
			return configs;
		}
		public Object getReportContext( )
		{
			return reportContext;
		}
	}
	/**
	 * @return Returns the runnable.
	 */
	public ReportRunnable getRunnable( )
	{
		return runnable;
	}
	/**
	 * @param runnable
	 *            The runnable to set.
	 */
	public void setRunnable( IReportRunnable runnable )