title: No keyword with name 'Start Virtual Display' found
body: <p>I've been doing some research into headless testing with Robot Framework and I've come across Xvfb. So I installed it with:</p>
  
  <p>pip install robotframework-xvfb</p>
  
  <p>Then in my test case file, I've added:</p>
  
  <pre><code>*** Settings ***
  Library  Selenium2Library
  Library  XvfbRobot
  
  *** Test Cases ***
  Creating a headless browser
      [Tags]  Headless
      Starting your display
      The user goes to the website
      Maximizing the window
      The user enters an incorrect email
      The user sees they have entered an incorrect email
  </code></pre>
  
  <p>My keywords are all good, no visible errors. Yet when I run the test, it returns the following:</p>
  
  <pre><code>Importing test library 'XvfbRobot' failed: ImportError: No module named xvfbwrapper
  Traceback (most recent call last):
    File "/usr/local/Cellar/robot-framework/3.0.2_1/libexec/lib/python2.7/site-packages/XvfbRobot/__init__.py", line 19, in &lt;module&gt;
      from xvfbwrapper import Xvfb
  </code></pre>
  
  <p>Anyone come across this? Thanks in advance!</p>