this should fix the "MySQL server has gone away" error on Travis. It only...

this should fix the "MySQL server has gone away" error on Travis. It only occurred sometimes as the timeout on travis is only 180 (28800 is mysql standard)

tests/PHPUnit/Fixture.php

@@ -151,6 +151,8 @@ class Fixture extends PHPUnit_Framework_Assert
             Config::getInstance()->database['dbname'] = $this->dbName;
             Db::createDatabaseObject();
 
+            Db::get()->query("SET wait_timeout=28800;");
+
             DbHelper::createTables();
 
             \Piwik\Plugin\Manager::getInstance()->unloadPlugins();