Allow garbage collector to clean all leftover files

Coin's garbage collector is leaving behind statefiles and logs which will eventually fill up any disk space.

To mitigate this problem completely, the garbage collector could remove any file have not been touched by any integration for large amount of time (eg. 60 days). This would mean collecting also state files and logs/

Statefiles and logs will be uploaded by publisher to remote servers so there is no reason to keep them on the main server.