Rework when_changed attribute to use weakrefs

Some fairly major changes to ensure that the Pin.when_changed property
doesn't keep references to the objects owning the callbacks that are
assigned. This is vaguely tricky given that ordinary weakref's can't be
used with bound methods (which are ephemeral), so I've back-ported
weakref.WeakMethod from Py3.4.

This solves a whole pile of things like Button instances not
disappearing when they're deleted, and makes composite devices
containing Buttons much easier to construct as we don't need to worry
about partially constructed things not getting deleted.

gpiozero/boards.py

@@ -211,24 +211,20 @@ class LEDCollection(CompositeOutputDevice):
         initial_value = kwargs.pop('initial_value', False)
         order = kwargs.pop('_order', None)
         LEDClass = PWMLED if pwm else LED
-        try:
-            super(LEDCollection, self).__init__(
-                *(
-                    pin_or_collection
-                    if isinstance(pin_or_collection, LEDCollection) else
-                    LEDClass(pin_or_collection, active_high, initial_value)
-                    for pin_or_collection in args
-                    ),
-                _order=order,
-                **{
-                    name: pin_or_collection
-                    if isinstance(pin_or_collection, LEDCollection) else
-                    LEDClass(pin_or_collection, active_high, initial_value)
-                    for name, pin_or_collection in kwargs.items()
-                    })
-        except:
-            self.close()
-            raise
+        super(LEDCollection, self).__init__(
+            *(
+                pin_or_collection
+                if isinstance(pin_or_collection, LEDCollection) else
+                LEDClass(pin_or_collection, active_high, initial_value)
+                for pin_or_collection in args
+                ),
+            _order=order,
+            **{
+                name: pin_or_collection
+                if isinstance(pin_or_collection, LEDCollection) else
+                LEDClass(pin_or_collection, active_high, initial_value)
+                for name, pin_or_collection in kwargs.items()
+                })
         leds = []
         for item in self:
             if isinstance(item, LEDCollection):