Tests module app

[andreyasko]

Knowledge assessment module, similar to Polls and Quizzes, but with broader assessment capabilities and specific features like

• support for open-ended and multiple-select questions;
• results private between Teacher (test author) and Student (test undertaker);
• post-to-specific user to test individually;
• post-to-context to post within a "Course" (powered by Groups, Spaces or Events);
• question "weight" - 1 to 5 points; percentile, pass/fail and AtoF grading.
• private discussion between teacher and student
• browsing for My Tests, Tests for Me, Attempted Tests, Completed Tests, Public Tests and Featured Tests.