I changed the init scripts to be more reliable.
hass executable supports the option --log-file. Using this is much safer and does not lead to problems with permission and overwriting old logfiles. Also I added creating the directory and ownership in the install function. To prevent log file groth I added a logrotate rule.
I moved the update-rc.d command you had in your manual into the install function since you already ad it in the uninstall function. This prevents more copy&paste errors.
I changed the PID file to be located in an extra directory. This way you do not have to to this hack with writing a fake PID file in the install function. Also, I read many users having problems that hass daemon is not starting (see eg. https://community.home-assistant.io/t/autostart-virtualenv-ubuntu-14-04/2120/37) without showing any errors. This is due to a missing PID file or its wrong permissions. By changing as stated and adding a test this problem should not arise any more.
I changes some wording in the manual to make it more understandable.
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