IDE-1069

Added support for validating user-notification-handler-class
element in liferay-portlet.xml.
IDE-1070

Improved LiferayCore.create( ) to be able to handle
passing LiferayCore.create( getRuntime() );
IDE-1070

Fixed NullPointerException when create
portlet class in new portlet project wizard;
reloaded entry categories when switch projects
of different portal versions.