Eat own dogfood: use external/amber-dev directly

.travis.yml

@@ -7,6 +7,8 @@ install:
   - npm install
   - cd external/amber-cli
   - npm install
+  - cd ../amber-dev
+  - npm install
   - cd ../..
 script:
   - npm test

Gruntfile.js

@@ -3,7 +3,7 @@ var path = require('path');
 module.exports = function(grunt) {
 
   grunt.loadTasks('./internal/grunt-tasks');
-  grunt.loadNpmTasks('amber-dev');
+  grunt.loadTasks('./external/amber-dev/tasks');
 
   grunt.loadNpmTasks('grunt-contrib-jshint');
   grunt.loadNpmTasks('grunt-contrib-clean');

package.json

@@ -29,7 +29,6 @@
     "test": "grunt test && cd external && cd amber-cli && npm test && cd .. && cd .."
   },
   "devDependencies": {
-    "amber-dev": "^0.5.0",
     "grunt": "^0.4.0",
     "grunt-contrib-clean": "^0.6.0",
     "grunt-contrib-jshint": "^0.11.0",