Ignore readdirp errors

When readdirp is processing a directory and a file/directory is removed
just before readdirp calls (l)stat on it, it gives an 'error'. It's
safer to ignore it.

lib/fsevents-handler.js

@@ -363,7 +363,9 @@ function(path, transform, forceAdd, priorDepth) {
         } else {
           emitAdd(joinedPath, entry.stat);
         }
-      }.bind(this)).on('end', this._emitReady);
+      }.bind(this)).on('error', function() {
+        // Ignore readdirp errors
+      }).on('end', this._emitReady);
     } else {
       emitAdd(wh.watchPath, stats);
       this._emitReady();