Added convenience method to create test data

I've created a convenience method inside util.factories that that can be used to construct a complete grady instance by passing a big dictionary to the method. At the moment one call to the method with some sample data is hardcoded but using the helper methods inside factories, it is possible to generate big instances with multiple user/submissions/feedback programatically. This should be especially helpful to test the layout and structure of the app under more 'real-life' circumstances.