Added Thermo Sensor THR228N

Hi magellannh,

I added some code for the Oregon Scientific Thermo Sensor THR228N. Can it be integrated in your fork?
I will create an issue for it also.
Any plans for getting your OS code in the original of Merbanan?

BTW: this is my first modest contribution / pull request on Github, so please bear with me if I'm making some mistake regarding the process.

    Regards,
    Corné