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
* <p>
	 * 
	 * @param resourceKey
	 *            resourceKey of the user-defined message where the translation
	 *            is defined in.
	 * @param locale
	 *            locale for the translation. Locale is in java-defined format(
	 *            en, en-US, zh_CN, etc.)
	 * @return the <code>Translation</code> that matches. return null if the
	 *         translation is not found in the report.
	 */
	public Translation findTranslation( String resourceKey, String locale )
	{
		return translations.findTranslation( resourceKey, locale );
	}
	/**
	 * Returns if the specified translation is contained in the translation
	 * table.
	 * 
	 * @param trans
	 *            a given <code>Translation</code>
	 * @return <code>true</code> if the <code>Translation</code> is
	 *         contained in the translation talbe, return <code>false</code>
	 *         otherwise.
	 */
	public boolean contains( Translation trans )
	{
		return translations.contains( trans );
	}
	/**