fixed a bug with subclasses
created a method to return url for class examples
getting actual examples data from API
making selected class display bold
moved method QueryBuilder.select_class to QueryBuilder.classes.select
added a method to display count of objects of selected class
showing examples of selected class
showing uri viewer of object examples of selected class
created proxy method to get subclasses
added method to get url of retrieving subclasses url
showing a '+' button if the class has some subclasses
some changes in QueryBuilder.js
created a skeleton method for "+" button in class histogram
not showing subclasses filter when there is no subclasses
showing subclasses in class select histrogram
some fix in histogram
showing complete data in select class histogram
added a loading image in class select histogram
making sure the loading image closes even in cases of error in class select histogram