Specify error as first argument

spec/directory-spec.coffee

@@ -82,7 +82,7 @@ describe "Directory", ->
       waitsFor -> callback.callCount is 1
 
       runs ->
-        entries = callback.mostRecentCall.args[0]
+        entries = callback.mostRecentCall.args[1]
         for entry in entries
           name = entry.getBaseName()
           if name is 'symlink-to-dir' or name is 'symlink-to-file'

src/directory.coffee

@@ -122,7 +122,7 @@ class Directory
             callback()
 
       async.eachLimit entries, 1, statEntry, ->
-        callback(directories.concat(files))
+        callback(null, directories.concat(files))
 
   # Private:
   subscribeToNativeChangeEvents: ->