Gemstone Hunters update 1.0.1

An update to address a few issues.

One of my friends said in his browser Esc key didn't open Pause menu while in game so he couldn't leave game early. For this I decided to add a small button with cog icon while in game to access pause menu.

Others complained that in 4th game mode finding a gem was too hard and boring. Now only shared stach has increased gem stack size leaving right side standart size and adding exta gems once match is found. Both stack sizes are also separately changeable.