gabrielecirulli/2048 — pull request #65 by chuyaguo (2014-03-17 00:38:53+00:00)
Title: created a prompt for number of inital tiles and changed the possible value for random tiles

- a prompt at the beginning of the game to let user enter the number of tiles to appear initially
- the values on random tiles can now be:1, 2, 4, 8 (20% chance to get an 8); making the game both harder (due to the presence of 1) and easier (if you get an 8).