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
* Evaluate a BIRT expression
	 * 
	 * @param source
	 *            the expression to be evaluated
	 * @return the result if no error exists, otherwise null.
	 * 
	 * @see evaluate(String,String,int)
	 */
	public Object evaluate( String source )
	{
		return evaluate( source, "<inline>", 1 );
	}
	/**
	 * Evaluate a BIRT expression
	 * 
	 * @param expr
	 *            the expression to be evaluated
	 * @param name
	 *            the file name
	 * @param lineNo
	 *            the line number
	 * 
	 * @return the result if no error exists, otherwise null.
	 */
	public Object evaluate( String expr, String name, int lineNo )
	{
		if ( expr != null )
		{
			try
			{