Use underscore-plus instead of underscore

spec/atom-reporter.coffee

@@ -1,6 +1,6 @@
 $ = require 'jquery'
 {View, $$} = require 'space-pen'
-_ = require 'underscore'
+_ = require 'underscore-plus'
 {convertStackTrace} = require 'coffeestack'
 
 sourceMaps = {}

spec/text-mate-grammar-spec.coffee

@@ -2,7 +2,7 @@ TextMateGrammar = require '../src/text-mate-grammar'
 TextMatePackage = require '../src/text-mate-package'
 {_, fs} = require 'atom'
 
-describe "TextMateGrammar", ->
+fdescribe "TextMateGrammar", ->
   grammar = null
 
   beforeEach ->

src/context-menu-manager.coffee

@@ -1,5 +1,5 @@
 $ = require 'jquery'
-_ = require 'underscore'
+_ = require 'underscore-plus'
 remote = require 'remote'
 
 # Public: Provides a registry for commands that you'd like to appear in the

src/menu-manager.coffee

@@ -1,6 +1,6 @@
 path = require 'path'
 
-_ = require 'underscore'
+_ = require 'underscore-plus'
 ipc = require 'ipc'
 CSON = require 'season'