made changes to State and Iterator to use (row, col) rather than (x, y). Tested using JUnit class.
Merge branch 'master' of https://github.com/tstullich/mancala

Conflicts:
	src/MancalaModelTester.java

removed and backed up ModelTester. Will replace with
what I changed. This is why I was iffy about having someone else use the
model's test class.
readded MancalaModelTester