Upgrade to node 6

We no longer need to require Promise.

.travis.yml

@@ -3,7 +3,7 @@ before_install:
   - sudo apt-get install libcairo2-dev libjpeg8-dev libpango1.0-dev libgif-dev build-essential g++
 language: node_js
 node_js:
-  - 0.10
+  - 6
 
 branches:
   only:

package.json

@@ -25,7 +25,6 @@
     "camp": "~16.2.0",
     "semver": "~4.3.3",
     "bower": "~1.4.1",
-    "promise": "~7.0.0",
     "chrome-web-store-item-property": "^1.1.2",
     "json-autosave": "~1.1.1"
   },
@@ -48,6 +47,5 @@
     "phantomjs-svg2png.js",
     "lru-cache.js",
     "logo"
-  ],
-  "engines": { "node": "0.10.x" }
+  ]
 }

suggest.js

@@ -1,6 +1,5 @@
 var nodeUrl = require('url');
 var request = require('request');
-var Promise = require('promise');
 var serverSecrets;
 try {
   // Everything that cannot be checked in but is useful server-side