First commit
Adding ChessBoard.java
Added functioning initial board layout
Added ability to move one piece (no moving rules yet)
Changed ChessPieces to include subclasses by piece type, added input for
moves
Enabled two colors of pieces
Added more move validity checks on origin and destination spaces,
looped input
Added "move" checks for pieces in between "from" and "to" spaces
Added ability for all pieces 
to do basic captures
Enabled correct capture of piece of the other color
Fixed diagonal move checking for bishops/queens
Add alternating between two players
Added ability for pawn to turn into others once it reaches end
Fixed loophole where you could get a valid move by moving to a space
occupied by your own piece
Changed display() to add row/column labels
Added ability for pawn to move forward two spaces on first move