It seemed to be easier all around to use NPM to manage the dependancy on HAP-NodeJS.
This PR removes the submodule, and adjusts the paths of all checked in shims to reference the NPM module instead.
I also updated the documentation to reflect the simpler install ;)
Current version operates the "first door found". For users with multiple doors, this allows them to specify a specific door with the 'requiredDeviceId' option in config.
