[modules/pulseaudio] Automatically restart pulseaudio daemon
[modules/pulseaudio] Automatically restart pulseaudio daemon

If the current volume and mute status cannot be retrieved, the most
likely explanation is that the pulseaudio daemon is not running.
Automatically start it in such a case.

Also, add a parameter "autostart" to the pulseaudio module to disable
this behaviour in case it causes issues.

see #108

tobi-wan-kenobi/bumblebee-status,tobi-wan-kenobi/bumblebee-status