Add more advanced and remote recipes

docs/examples/whos_home_leds.py

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+from gpiozero import PingServer, LEDBoard
+from gpiozero.tools import negated
+from signal import pause
+
+status = LEDBoard(
+    mum=LEDBoard(red=14, green=15),
+    dad=LEDBoard(red=17, green=18),
+    alice=LEDBoard(red=21, green=22)
+)
+
+statuses = {
+    PingServer('192.168.1.5'): status.mum,
+    PingServer('192.168.1.6'): status.dad,
+    PingServer('192.168.1.7'): status.alice,
+}
+
+for server, leds in statuses.items():
+    leds.green.source = server.values
+    leds.green.source_delay = 60
+    leds.red.source = negated(leds.green.values)
+
+pause()