Added Week 0 project

Standard example project from the course's setup.
Added Week 1 project

Completes exercises listed here:
https://class.coursera.org/progfun-002/assignment/view?assignment_id=4
Added Week 2 project

Completes exercises listed here:
https://class.coursera.org/progfun-002/assignment/view?assignment_id=3
Added Week 3 project

Completes exercises listed here(except ex 4):
https://class.coursera.org/progfun-002/assignment/view?assignment_id=9