title: Add files to code-coverage white/blacklists in `bootstrap.php` for PHPUnit
body: <p>PHP_CodeCoverage 1.1 removed the singleton accessor for <code>PHP_CodeCoverage_Filter</code> that allowed our PHPUnit <code>bootstrap.php</code> files to add directories to the white/blacklists. PHPUnit 3.5 used the blacklist to strip classes from exception stack traces, and CC uses the whitelist to limit tracking. We used both of these features.</p>
  
  <p>How can I get the <code>PHP_CodeCoverage_Filter</code> instance that PHPUnit will use from the <code>bootstrap.php</code> file?</p>
  
  <p><strong>Note:</strong> We cannot put these into <code>phpunit.xml</code> because the paths are built from environment variables and config files.</p>
  
  <p><strong>Update:</strong> I see that <code>PHPUnit_Util_Filter</code> no longer uses the code coverage blacklist for filtering stack traces. This is fine, and since this class is designed for static access I could add a method to add user directories to the list. It would be an easy change and solve half of this question.</p>