public static void pause(int td) uses bad practices for time

[dylanwilbur]

Using nested for loops takes up memory and cannot accurately pause time across different machines.
Also, it did not pause for td seconds as the readme suggests, as it is not really feasible to accurately measure time with for loops.

In Canvas.java:

public static void pause(int td) {
  try {
    Thread.sleep(td*1000)
  } catch(InterruptedException ex) {
    Thread.currentThread().interrupt();
  }
}