Revert "Merge pull request #684 from Menerve/prints_to_loggers"

This reverts commit 4419ac5b823fdbc0573b290ddd574adbbcb574a8, reversing
changes made to cb79b20da2654c6750fb7b3394b1ecab7064a25f.
Merge pull request #707 from memimo/revert_logger

Revert "Merge pull request #684 from Menerve/prints_to_loggers"