Generic docs need reST

Conversion of all docs to reST so that the generic docs can link easily
with the rest of the docs.

docs/api_output.rst

@@ -0,0 +1,44 @@
+==============
+Output Devices
+==============
+
+.. currentmodule:: gpiozero
+
+These output device component interfaces have been provided for simple use of
+everyday components. Components must be wired up correctly before use in code.
+
+.. note::
+
+    All GPIO pin numbers use Broadcom (BCM) numbering. See the :doc:`recipes`
+    page for more information.
+
+
+LED
+===
+
+.. autoclass:: LED(pin, active_high=True)
+    :members: on, off, toggle, blink, pin, is_lit
+
+PWMLED
+======
+
+.. autoclass:: PWMLED(pin, frequency=100)
+    :members: on, off, toggle, blink, pin, is_lit, value
+
+Buzzer
+======
+
+.. autoclass:: Buzzer(pin, active_high=True)
+    :members: on, off, toggle, beep, pin, is_active
+
+RGBLED
+======
+
+.. autoclass:: RGBLED(red, green, blue)
+    :members: on, off, red, green, blue, value
+
+Motor
+=====
+
+.. autoclass:: Motor(forward, backward)
+    :members: forward, backward, stop