Added 2 new methods for getting questions. One for getting all the questions in a specified catgeory and another to grab all questions in an array of specified categories.
Since there is no global category list, the getAllQuestions(String[] cats) is a pseudo "grab all questions from database" while the getAllCatQUestions(String cat) does
the same but only for a single specified category. CHECK THE JAVADOCS FOR DETAILS ON USAGE.