Crystal mode. There are 3 crystal zealots each with their own unique crystals, which have powers that you can activate by clicking while in your hand. Each zealot must collect 2 crystals to complete their objective; they can find more crystals by examining their own crystal and it will glow depending on how close other crystals are.
 * Fixed the players required.
 * Forgot a file.
Merge pull request #360 from Giacomand/GameJam_Crystal

[JAM] Crystal mode.