Timers: added a StopTimer action
Timers are now killed when main exits
Shutdown module added
Merge remote-tracking branch 'origin/dev' into timers

Conflicts:
	canvashs-module/CanvasHs.hs
	canvashs-module/CanvasHs/Server.hs
Fix
BSL.writeFile instead of BS.writeFile
Merge pull request #81 from CanvasHS/timers

Timers fixed