moved "/rosick" folder to "/src/main/java/rosick"
renamed "rosick" package to "fcagnin"
renamed "mckesson" packate to "gltut"
rewrote TutorialChooser.java without reflection
renamed tutorial files to match the names used in the original project
removed packages "I", "II", "III" and "IV" to better match the the original project's directory layout
moved LWJGLWindow.java and TutorialChooser.java to "src/main/java/fcagnin/gltut/"
updated README.md