title: RobotFramework / Selenium: How to set screenshot-name to testcase-name on failure
body: <p>I was wondering if there is a possibility to make the following happen. Let's say I have 3 Testcases with the following results in RIDE:</p>
  
  <pre><code>Testcase Easter  --  PASS
  Testcase Christmas  --  FAIL
  Testcase Foo  --  PASS
  </code></pre>
  
  <p>I want to take a screenshot which should be named testcase_christmas.png (or with ' ' instead of '_', that does not matter). Is there a possibility to do it dynamically, something like</p>
  
  <pre><code>${testcase}=    Get Testcase Name
  Capture Page Screenshot    ${testcase}
  </code></pre>
  
  <p>or anything like that? I am using:</p>
  
  <ul>
  <li>Python 2.7.x (latest) 32 bit</li>
  <li>wxPython 2.8 32 bit</li>
  <li>geckodriver latest 64 bit</li>
  </ul>