Improve authentication detection

Add a negative check in the event we are authenticated and registered,
but not confirmed, as this fools other checks.

conf/example/irc.json

@@ -3,14 +3,21 @@
         "register": true,
         "entity": "NickServ",
         "email": "{nickname}@domain.com",
-        "register": "REGISTER {password} {email}",
+        "registermsg": "REGISTER {password} {email}",
         "confirm": "CONFIRM {token}",
         "check": true,
         "ping": true,
-        "pingmsg": "STATUS {nickname}",
+        "negative": true,
+        "pingmsg": "STATUS",
+        "negativemsg": "INFO {nickname}",
         "checktype": "mode",
         "checkmode": "r",
         "checkmsg": "Password accepted - you are now recognized.",
-        "checkmsg2": "You are logged in as"
+        "checkmsg2": "You are logged in as",
+        "checknegativemsg": "has \u0002NOT COMPLETED\u0002 registration verification",
+        "checkendnegative": "End of Info"
+    },
+    "freenode": {
+        "confirm": "VERIFY REGISTER {nickname} {token}"
     }
 }