Merge pull request #72 from paulvojta/master

Fixed a buggy problem, and fixed typos in solutions
Removing duplicates (from E McNells)
Fix typesetting problem
Update README

fix spelling
Committing an updated version of the Alfred library to the OPL.
The problems that depended on jsmath mode have been rewritten to
viewing mode independent. Redundant questions have been removed.
Adding the alfred macros file
Merge pull request #73 from darwyncook/master

Updated version of the Alfred libraries
Iframe embedding
New matrix answer template file

for the subject area templates wiki
Update
Another new matrix answer template file
Update keywords
Add PGcourse.pl
Update MatrixAnswer1.pg
New matrix operations template file
New matrices and custom answer checkers template
Include embedding YouTube videos
New row operations question
New diagonalization problem.
Small fix.