Use script/cibuild

.travis.yml

@@ -1,14 +1,8 @@
 language: objective-c
 
-install: script/build
-
-script: ./apm/node_modules/.bin/apm test --path ./atom.sh
+script: script/cibuild
 
 notifications:
   email:
     on_success: never
     on_failure: change
-
-cache:
-  directories:
-    - node_modules

build/tasks/spec-task.coffee

@@ -4,7 +4,7 @@ path = require 'path'
 _ = require 'underscore-plus'
 async = require 'async'
 
-concurrency = 2
+concurrency = 1
 
 module.exports = (grunt) ->
   {isAtomPackage, spawn} = require('./task-helpers')(grunt)