added list/HOF pracitce problems and solutions for disc 3. michael should give me a foot massage
update hw3 due date
Merge branch 'master' of cory.cs.berkeley.edu:~/public_html/sp14

* 'master' of cory.cs.berkeley.edu:~/public_html/sp14:
  added list/HOF pracitce problems and solutions for disc 3. michael should give me a foot massage