Add names of members of system wiki group
Add wiki controller, views and model files
revert pull request #28
test
test
Added utility functions plus refactoring.

- Functions added:
  - students_in_section(section_id)
  - students_in_course(course_id)
  - student_group_id()
  - teacher_group_id()
  - administrator_group_id()
removed a group member at his request
add
uploads
updating Group Video Chat member list
Add wiki option in menu
Merged commits through 10/17
Added simple controller and view to test embedding and linking a youtube video given the youtube_id.  Also fixed several bugs from people who don't know what they're doing.
Added recording database table
Added video and create functions for recordings controller. Fixed merge conflict.
Changed video to view. Added code to retrieve course section for index and video for view
Added some test videos to database for course_section 1 and updated index to show all videos for a section.
Added tests in controllers in recording.py to verify teacher or student of class
Made teacher/student check more thorough in index. Fixed some redirect issues.
One more little thing.