Merging last year's text for Week 3.
Manual updates for Week 3.
Images for Week 3.
Minor mistake in referencing K3Supervisor.m from last year.
Fixed small typo.
Fixed minor mistake about testing ensure_w.
Fixed a \max to a \min.
Mistook +quickbot for +supervisor.
Merge branch 'coursera-sp14' of github.com:jdelacroix/simiam into coursera-week-4