Added 5 bag randomizer

tetris/randomizers/bag5.lua

@@ -0,0 +1,17 @@
+local Randomizer = require 'tetris.randomizers.randomizer'
+
+local Bag5Randomizer = Randomizer:extend()
+
+function Bag5Randomizer:initialize()
+	self.bag = {"I", "J", "L", "O", "T"}
+end
+
+function Bag5Randomizer:generatePiece()
+	if next(self.bag) == nil then
+		self.bag = {"I", "J", "L", "O", "T"}
+	end
+	local x = math.random(table.getn(self.bag))
+	return table.remove(self.bag, x)
+end
+
+return Bag5Randomizer