Return exit code 0 when stopping a non-running process

If any other error occurs in the stop script it will just raise an error as expected and not start sickbeard.
Add Vacuum action to history trim/clear functions to reclaim space.
Minor typo fix on ConfigPostProcessing
Merge pull request #870 from thezoggy/dev--history_vacuum

vacuum on history clear/trim
Merge pull request #868 from jeroenj/patch-1

Return exit code 0 when stopping a non-running process in ubuntu init script
Add ability to skip notices (snatched/download) per show. PEP8 fixes as well.
Useful for those that fetch shows for their significant others that don't care to get the notification noise. Or if they know they are about get a bunch of notices (backloging a show/season rips) they can quickly turn the notifications off for that show.