Update README and updated collaborator names
Finish notes
Write core Piece class
Big commit - Write and fix bugs in Board, Piece, and SlidingPiece classes

 - Start stepping piece
 - Finish sliding piece
 - Wrote prototype board for debugging (to_s)
 - Add unsafe update method to board
Fix bug in all move methods

 - Should function properly now
 - Wrote Knight class
SteppingPiece#move works (Knight and King)
Add other Piece subclasses (R,B,K,Q)
Board setup

 - Fix pawn initialize bug
 - Move Board class to its own file
 - Wrote board setup
Game check condition works
Board can move pieces
Small refactoring of piece.rb
Updated board#to_s
Start Piece#move_into_check?
Trying to debug piece#moves: going to make NilPiece
needs work