FIX: TestRunner was not cleaning up DB on failure

When a unit test being run by PHPUnit encountered a fatal error,
TestRunner::tearDown was never being called. This resulted in tmpdb schemas
littering the database from failed test runs. This changeset fixes the issue
by registering TestRunner::tearDown as a shutdown function, so that it gets
called even in the event of a PHP Fatal Error.

dev/TestRunner.php

@@ -315,6 +315,12 @@ class_exists($className);
 		$phpunitwrapper->setSuite($suite);
 		$phpunitwrapper->setCoverageStatus($coverage);
 
+		// Make sure TearDown is called (even in the case of a fatal error)
+		$self = $this;
+		register_shutdown_function(function() use ($self) {
+			$self->tearDown();
+		});
+
 		$phpunitwrapper->runTests();
 
 		// get results of the PhpUnitWrapper class