Logging

[gdejohn]

Would logging from this library be helpful to end users? Can it be done with zero performance cost when logging is disabled, while also allowing end users to plug in whatever backend logging implementation they want?

• https://github.com/forax/beautiful_logger
• https://google.github.io/flogger/anatomy
• http://maven.apache.org/guides/introduction/introduction-to-optional-and-excludes-dependencies.html