Merge pull request #45 from nickdotreid/pip

added missing libraries from assignments/detail page
more explanation for PS6
Merge branch 'pip' of github.com:presnick/runestone into pip
simplified PS6
replaced double-quoted uu with single-quoted uu; just u on its own gets misinterpreted because of a hack in runestone paver
Add pset5 solutions
Merge pull request #47 from aerenchyma/pset5sol

Add pset5 solutions
fixed naming of a couple actex directives to avoid duplication
Added solutions for problem 1 & 2
added problem 3 solution
added problem 3 solution
added problem 4 solution
added solutions for 4 and 5
added solution for problem 6
added solution for problem 7
added problem 8 solution