This releases resolves several issues when Close() is used, from leaking file descriptors to blocking issues. It also is using epoll when reading events on Linux to avoid blocking.

• inotify: use epoll to wake up readEvents #66 #5 (thanks @PieterD)
• inotify: deleted file watches can now be removed #40
• inotify: closing watcher should now always shut down goroutine #63 (thanks @PieterD)
• kqueue: close kqueue after removing watches, fixes #59