phpunit: Do not exclude mf1 group

Over half (22/39) of the mf1 backwards compatibility tests passes.
We just marked the bad ones as skipped so we can run everything.

Author: jtojnar

phpunit.xml

@@ -5,9 +5,4 @@
 			<directory suffix="Test.php">tests/Mf2</directory>
 		</testsuite>
 	</testsuites>
-	<groups>
-		<exclude>
-			<group>microformats/tests/mf1</group>
-		</exclude>
-	</groups>
 </phpunit>