Unsuccessful trip attacks by null dice now do not impart null
Added responderTest to confirm that unsuccessful trip attacks by null dice do not impart null
Removed unused comment
Merge pull request #1369 from blackshadowshade/1362_null_trip

Null dice do not impart null on unsuccessful attack
Merge remote-tracking branch 'upstream/master' into 1367_doppelganger_fail

Manually resolved conflicts in:
	test/src/api/responderTest.php