Add StatusBoard and StatusZero to docs and device hierarchy

docs/api_boards.rst

@@ -127,6 +127,20 @@ Energenie
     :inherited-members:
     :members:
 
+StatusZero
+==========
+
+.. autoclass:: StatusZero
+    :inherited-members:
+    :members:
+
+StatusBoard
+===========
+
+.. autoclass:: StatusBoard
+    :inherited-members:
+    :members:
+
 SnowPi
 ======
 
@@ -168,4 +182,3 @@ CompositeDevice
 
 .. autoclass:: CompositeDevice(\*args, _order=None, \*\*kwargs)
     :members:
-

docs/images/device_hierarchy.dot

@@ -90,11 +90,13 @@ digraph classes {
     ButtonBoard->HoldMixin;
     PiLiter->LEDBoard;
     PiLiterBarGraph->LEDBarGraph;
+    StatusZero->LEDBoard;
     TrafficLights->LEDBoard;
     SnowPi->LEDBoard;
     PiTraffic->TrafficLights;
     PiStop->TrafficLights;
     TrafficLightsBuzzer->CompositeOutputDevice;
+    StatusBoard->CompositeOutputDevice;
     FishDish->TrafficLightsBuzzer;
     TrafficHat->TrafficLightsBuzzer;
     Robot->CompositeDevice;
@@ -115,4 +117,3 @@ digraph classes {
     PingServer->InternalDevice;
     CPUTemperature->InternalDevice;
 }
-