title: NPM Concurrently not running mocha test
body: <p>I am using the npm package <a href="https://www.npmjs.com/package/concurrently" rel="nofollow">concurrently</a> to run multiple processes needed for a test.</p>
  
  <p>When I run mocha alone like this:</p>
  
  <pre><code>./node_modules/mocha/bin/mocha  --harmony ./tests/
  </code></pre>
  
  <p>it works fine.  But when I try to use it with <strong>concurrently</strong> like this:</p>
  
  <pre><code>./node_modules/concurrently/src/main.js "./node_modules/mocha/bin/mocha  --harmony ./tests/"
  </code></pre>
  
  <p>I get an error like this: </p>
  
  <pre><code>throw new Error("must provide pattern")
  [0]           ^
  [0] Error: must provide pattern
  [0]     at new Glob (/Users/my-project/node_modules/mocha/node_modules/glob/glob.js:121:11)
  </code></pre>