Added Jeff Erickson's Algorithms Course Materials

Includes homework and his algorithms course notes.  Only reason it's not a book is that Jeff says "All textbooks suck."

free-programming-books.md

@@ -141,6 +141,7 @@
 ####Algorithms & Datastructures
 * [Algorithms and Data-Structures](http://www.ethoberon.ethz.ch/WirthPubl/AD.pdf) (PDF)
 * [Algorithms](http://www.cs.berkeley.edu/~vazirani/algorithms.html) (draft)
+* [Algorithms Course Materials](http://compgeom.cs.uiuc.edu/~jeffe/teaching/algorithms/) - Jeff Erickson
 * [Binary Trees](http://cslibrary.stanford.edu/110/BinaryTrees.pdf)
 * [Clever Algorithms](http://www.cleveralgorithms.com/nature-inspired/index.html)
 * [Computational Geometry: Algorithms and Applications](http://www.cs.uu.nl/geobook/) (chapters 1 and 9, pseudo-code)