title: AssertionError - output is noisy. How do I show only Assertion
body: <p>When running the Intern Unit test example from Getting Started, when I changed the Hello unit script and ran it so it assert, it appears to be showing more detail (noisy) than what I need.  Is this output correct?  Is there a way to only show the AssertionError line and maybe the file / line where this assertion occurred?</p>
  
  <p>unit_hello.js:</p>
  
  <pre><code>define([
      'intern!object',
      'intern/chai!assert',
      'app/hello'
  ], function (registerSuite, assert, hello) {
  registerSuite({
      name: 'hello',
  
      greet: function () {
          assert.strictEqual(hello.greet('Name'), 'Hello, Name!',
              'hello.greet should return a greeting for the person name in the first argument');
          assert.strictEqual(hello.greet(), 'Hello, World!',
              'hello.greet with no arguments should return a greeting to "world"');
          }
      });
  });
  </code></pre>
  
  <p>Output:</p>
  
  <pre><code>user@pcname:~/intern_example$ ./node_modules/.bin/intern-client config=tests/intern_unit
  FAIL: main - hello - greet (1ms)
  AssertionError: hello.greet with no arguments should return a greeting to "world":  expected 'Hello, world!' to equal 'Hello, World!'
    at Function.assert.strictEqual  &lt;node_modules/intern/node_modules/chai/chai.js:2487:32&gt;
    at Test.registerSuite.greet [as test]  &lt;tests/unit/unit_hello.js:13:20&gt;
    at Test.run  &lt;node_modules/intern/lib/Test.js:169:19&gt;
    at &lt;node_modules/intern/lib/Suite.js:237:13&gt;
    at signalListener  &lt;node_modules/intern/node_modules/dojo/Deferred.js:37:21&gt;
    at Promise.then.promise.then  &lt;node_modules/intern/node_modules/dojo/Deferred.js:258:5&gt;
    at runTest  &lt;node_modules/intern/lib/Suite.js:236:46&gt;
    at &lt;node_modules/intern/lib/Suite.js:249:7&gt;
    at process._tickCallback  &lt;node.js:419:13&gt;
  1/1 tests failed
  1/1 tests failed
  </code></pre>