Add Some course notes from Professor Stewart Weiss at Hunter College

Add Some course notes from Professor Stewart Weiss at Hunter College
Add UNIX System Programming (formerly UNIX Tools) to the list 

Add UNIX System Programming (formerly UNIX Tools) to the list
Update README.md

Added descriptions
Update README.md

Switch around where the courses were listed...
Merge pull request #4 from robbyoconnor/master

Add Some course notes from Professor Stewart Weiss at Hunter College