Refactor of how devices and network interact - Injectors now pass ownership
of devices to Network.
Mock devices are not disposed when removed from the network.
Services now manage CpDevice references.
DeviceMediaEndpoint now manage CpDevice references.
Merge branch 'master' of ssh://core.linn.co.uk/home/git/ohTopology

Conflicts:
	src/ohTopology/DeviceMediaEndpoint.cs