added updated version of SimpleGui1 to my src directory - done with Step 5
copied source files and updated package names into simple directory - done with Step 7
added snowman head and copied advanced files
created Cat and FancyCat in place of House, HouseWithWindows, and CoffeeCup
Merge pull request #1 from j-so/master

Added Cat and Fancy Cat classes, modified Snowman, and SimpleGui1