Don't emit unlink on previously removed paths

Resolves gh-236

lib/index.js

@@ -324,15 +324,17 @@ FSWatcher.prototype._remove = function(directory, item) {
     this._remove(path, nestedItem);
   }, this);
 
-  // Remove directory / file from watched list.
-  this._getWatchedDir(directory).remove(item);
+  // Check if item was on the watched list and remove it
+  var parent = this._getWatchedDir(directory);
+  var wasTracked = parent.has(item);
+  parent.remove(item);
 
   // The Entry will either be a directory that just got removed
   // or a bogus entry to a file, in either case we have to remove it
   delete this._watched[path];
   delete this._watched[fullPath];
   var eventName = isDirectory ? 'unlinkDir' : 'unlink';
-  if (!this._isIgnored(path)) this._emit(eventName, path);
+  if (wasTracked && !this._isIgnored(path)) this._emit(eventName, path);
 };
 
 // Public method: Adds paths to be watched on an existing FSWatcher instance