[DAEMON-36] node-appc: fs watch doesn't properly handle symlinks

The filesystem watch function doesn't properly handle symlinks. It doesn't check if a file/directory is a symlink. The problem is when there's a symlinked directory to a parent directory or a directory that is being watched. The fs watcher needs to detect a symlinked directory, then watch the real path, not the symlink. We still need to track the symlink directory, but it needs to make sure that changes to the real path are propagated to the watcher of the original path.