Make bans pretend to use names like before 1.7.8.

Bans require a name and UUID but our API only allows for a single string
identifier for a ban entry. Until this is sorted out go back to the old
name based setup since we can always get a UUID given a name.

src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -1356,8 +1356,6 @@ public final class CraftServer implements Server {
         case IP:
             return new CraftIpBanList(playerList.getIPBans());
         case NAME:
-            return null;
-        case UUID:
         default:
             return new CraftProfileBanList(playerList.getProfileBans());
         }