title: SyntaxError: Use of const in strict mode inside github and codeship
body: <p>I've found following error when I run <code>grunt test</code> inside my source code Github/Codeship.</p>
  
  <p>In setup command inside codeship, following code are configured like that.</p>
  
  <pre><code>nvm install 0.12.6
  nvm use 0.12.6
  npm install grunt-cli bower -g
  npm install
  bower install -p
  npm run update-webdriver
  </code></pre>
  
  <p>and test commands inside codeship;</p>
  
  <pre><code>grunt test
  </code></pre>
  
  <p>But that error not found inside my source code, and actually found inside github/codeship by viewing following error message given by codeship. Because those folder structure is not defined as we configure in our server. Please help me how to solve it. Thanks.</p>
  
  <pre><code>Using 2 x hasMany to represent N:M relations has been deprecated. Please use belongsToMany instead
  &gt;&gt; Mocha exploded!
  &gt;&gt; /home/rof/src/github.com/MyProjects/node_modules/sparkpost/node_modules/request/node_modules/hawk/node_modules/boom/lib/index.js:5
  &gt;&gt; const Hoek = require('hoek');
  &gt;&gt; ^^^^^
  &gt;&gt; SyntaxError: Use of const in strict mode.
  &gt;&gt;     at exports.runInThisContext (vm.js:73:16)
  &gt;&gt;     at Module._compile (module.js:443:25)
  &gt;&gt;     at Object.Module._extensions..js (module.js:478:10)
  &gt;&gt;     at Module.load (module.js:355:32)
  &gt;&gt;     at Function.Module._load (module.js:310:12)
  &gt;&gt;     at Module.require (module.js:365:17)
  &gt;&gt;     at require (module.js:384:17)
  &gt;&gt;     at Object.&lt;anonymous&gt; (/home/rof/src/github.com/MyProjects/node_modules/sparkpost/node_modules/request/node_modules/hawk/lib/index.js:5:33)
  &gt;&gt;     at Module._compile (module.js:460:26)
  &gt;&gt;     at Object.Module._extensions..js (module.js:478:10)
  &gt;&gt;     at Module.load (module.js:355:32)
  &gt;&gt;     at Function.Module._load (module.js:310:12)
  &gt;&gt;     at Module.require (module.js:365:17)
  &gt;&gt;     at require (module.js:384:17)
  &gt;&gt;     at Object.&lt;anonymous&gt; (/home/rof/src/github.com/MyProjects/node_modules/sparkpost/node_modules/request/request.js:9:12)
  &gt;&gt;     at Module._compile (module.js:460:26)
  Warning: Task "mochaTest:src" failed. Use --force to continue.
  </code></pre>