Setting up namespace in sudoku.js.  Laying out a grid object to control different sized Sudoku puzzles.  Board object that sets up the game board onload.  Creates a board with grid.width x grid.height dimensions, and assigns each cell a unique id '#_#_#', eg 0_1_2 for cell in 0th square, 1st row and 2nd column.  Playing with initial styles, button placement, etc.