#571 MoreThanOneLogger should have parameter for logger classes

[Marco Eckstein]

Currently, the rule MoreThanOneLogger only recognizes the loggers org.apache.log4j.Logger and java.util.logging.Logger. I am using using org.slf4j.Logger.

So, it is desirable to be able to configure this rule with logger names.

If you cannot do this, please at least extend it with org.slf4j.Logger, which should take five minutes.