Method to format the matrix when logging

[Radilx]

The visualize method is great, but when I'm trying to debug creating an element like that can be annoying. I added a pprint method that logs the Matrix to the console much more nicely:

[ [ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ],
  [ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ],
  [ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ] ] 

This way, you can easily see the dimensions.

[shiffman]

Thank you for this! I've also been using console.table() which is very useful.