added  User_test, Task_test, TaskProgress_test, CourseProgress_test, commented out PassageTest
added total_tasks to courses model
Merge branch 'AddedModelDefs' into tests
added total_tasks def to courses model to clean up test
added old comments back in
started testing the course model
Merge pull request #35 from nbrawand/tests

Start work on unit tests.
Using round instead of math.ceil for calculating course progress.
Test file is now pep8 compliant.
Missed some PEP8 fixes.
Course progress is now calculated properly when uncompleting a task.