Merge branch 'spoken_tutorial'
Merge branch 'master' of https://github.com/FOSSEE/online_test
Models modified.

QuestionPaper model modified for generating random questions.
Added language field to Question model.
Removed tags from Quiz model.
Template and javascript for Add and Edit questions modified.
Added test cases for models.
Changes made as per the suggestions.
TestCases Separated
Added assertion in test_get_random_questions, to check the order of questions.
Made changes to update_total_marks method
Merge pull request #25 from prathamesh920/question_paper_generator

Question paper generator