added linux/mac daemon code

usage:
>cd /PlexConnect
>sudo ./PlexConnect_daemon.bash start
>sudo ./PlexConnect_daemon.bash status
>sudo ./PlexConnect_daemon.bash stop
Merge pull request #166 from bwynants/daemonized

added linux/mac daemon code.
...we have to find a way to limit adding clutter for every OS to be supported to the main directory, though.