Updated init.freebsd

* Removed the use of daemon to daemonize Sickbeard and made more use of
the default functions of FreeBSD and Sickbeard.
* Also removed the need to edit the init file. The file gets it's settings
directly from the sickbeard config file. All configuration is done trough `/etc/rc.conf.local` or `/etc/rc.conf`. You only need to  add `sickbeard_enable=YES` and an optional user `sickbeard_user="someuser"` in `/etc/rc.conf.local` or `/etc/rc.conf`. For more configurable options check the file itself.
* Changed the `sickbeard_stop()` and `sickbeard_status()` functions to be a bit more resilient when
faced with strange situations.