Revert "add tile sets"

This reverts commit 449012a1f30fe040e426af18acab1a4d93267431.
Replace master branch with page content via GitHub
Merge ../2048 into gh-pages

Conflicts:
	index.html
	params.json
	style/main.css
	tile-sets/udacity/128.png
	tile-sets/udacity/16.png
	tile-sets/udacity/2.png
	tile-sets/udacity/256.png
	tile-sets/udacity/32.png
	tile-sets/udacity/4.png
	tile-sets/udacity/64.png
	tile-sets/udacity/8.png