Merge pull request #1 from jperedadnr/master

Added styling to tiles and grid like in the original game
Added Swipe handler for touch-enabled devices
stupid code to have one single point of change... just in case...
terrible hardcoded pixel size change to improve UI... needs refactoring and better responsive UI
lame animation to when someone reaches the winner value (set to 64 at this commit to see the animation)
fixed the bug '3 tiles are being merged' #3
Added game title
Added score with points per move animation
Replaced timestamp with boolean merged to check if cell has been merged in the same move
Added listener to scene size changes, keeping the game centered, but with fixed size