The File System State Monitor keeps track of the state of any number of paths
and will fire events when said state changes (create/update/delete).
FSSM supports using FSEvents on MacOS (with ruby 1.8), Inotify on GNU/Linux,
and polling anywhere else.
Copyright (c) 2011 Travis Tilley
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the So