Fix switchLayout test failure with Mongo
Remove ComposerFactoryView and complete todo task in code
EXOGTN-1608 move snapshot to view, and remove unused method
fixbug: save not success when switch layout
Review and improve the MVC implementation for Edit Layout
Simply the Models
Simply the models to make it more canonical to Backbone MVC
merge AbstractContainer with Container
Simply the models amd make it more canonical to Backbone MVC
EXOGTN-1608: Apply Backbone.sync
Simply the models and make it more canonical to Backbone MVC
fixbug: can not delete new portlet after added, rename css class .portlet to .window