Sangbum Kim

Change tile width dynamically to allow longer strings

5

 Not really a priority, but this is going to happen as number grows beyond 8192 :cry:, since current implementation uses `std::setw(4)` when prining each tile.

Add support for 'themed' tiles

2

First of all, :+1: for awesome project! One cool aspect of 2048 is *derivatives*, such as merging elements to get element with higher atomic number. Let's add support for such...

Feature: Implements 'themes'

16

Added Themes class to handle theming and applied to game (#51)