Add examples for integrating luv with cqueues

examples/cqueues-main.lua

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+--[[
+Demonstrates using luv with a cqueues mainloop
+]]
+
+local cqueues = require "cqueues"
+local uv = require "luv"
+
+local cq = cqueues.new()
+
+cq:wrap(function()
+	while cqueues.poll({
+		pollfd = uv.backend_fd();
+		timeout = uv.backend_timeout() / 1000;
+		events = "r";
+	}) do
+		uv.run("nowait")
+	end
+end)
+
+cq:wrap(function()
+	while true do
+		cqueues.sleep(1)
+		print("HELLO FROM CQUEUES")
+	end
+end)
+
+uv.timer_start(uv.new_timer(), 1000, 1000, function()
+	print("HELLO FROM LUV")
+end)
+
+assert(cq:loop())

examples/cqueues-slave.lua

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+--[[
+Demonstrates using cqueues with a luv mainloop
+]]
+
+local cqueues = require "cqueues"
+local uv = require "luv"
+
+local cq = cqueues.new()
+
+do
+	local timer = uv.new_timer()
+	local function reset_timer()
+		local timeout = cq:timeout()
+		if timeout then
+			uv.timer_set_repeat(timer, timeout * 1000)
+			uv.timer_again(timer)
+		end
+	end	
+	local function onready()
+		assert(cq:step(0))
+		reset_timer()
+	end
+	uv.timer_start(timer, 0, 0, onready)
+	uv.poll_start(uv.new_poll(cq:pollfd()), cq:events(), onready)
+end
+
+cq:wrap(function()
+	while true do
+		cqueues.sleep(1)
+		print("HELLO FROM CQUEUES")
+	end
+end)
+
+uv.timer_start(uv.new_timer(), 1000, 1000, function()
+	print("HELLO FROM LUV")
+end)
+
+uv.run()