Travis: Initiating build for commit 'e7c460432366f043b84c9f49fea40f528c769599' on branch 'master': Fixing issue when there is an invalid cache pointing to a file that does not exist anymore.
Should resolve error: `Warning: include_once(/home/piwik-demo2/www/plugins/ExamplePlugin/Columns/ExampleVisitDimension.php): failed to open stream: No such file or directory in /home/piwik-demo2/www/core/Plugin.php on line 356 `