Allow Logger subclasses

[khatchad]

Why is it not okay to subclass Logger?

https://github.com/ponder-lab/Logging-Level-Evolution-Plugin/blob/35cab4012aec01d7f2d14a366141b4371fa16c4a/edu.cuny.hunter.log.core/src/edu/cuny/hunter/log/core/utils/Util.java#L112

[khatchad]

Same problem here: https://github.com/ponder-lab/Logging-Level-Evolution-Plugin/blob/35cab4012aec01d7f2d14a366141b4371fa16c4a/edu.cuny.hunter.log.core/src/edu/cuny/hunter/log/core/utils/Util.java#L171