Extra spaces precede all Drupal output

The file "EpiFoursquare.php" contains two spaces before the opening <?php tag.

While this may seem trivial, it actually invalidates all RSS feeds or XML generated by Drupal.
The opening <?xml version="1.0" encoding="utf-8"?> tag MUST be the very first thing in the body of a request, and these two spaces prevent that from happening.