Converted XMLReader to instance class instead of static main driver
Preliminary progression generator
Preliminary ChordPairing
Implementation of the roulette for randomized next-Chord selection
Added unique chords to keep track of what's been seen already
Fleshed out progression generator
Added TestSuite JUnit to launch all tests
Changing Song's toString to take char key instead of int
Driver to build and play chord progressions
Update README to include latest challenges and update code plan
Controlled progression test
Merge branch 'progression-generator'