Change the logging to a proper logger instead of console.log everywhere!

[kenotron]

This should allow someone to filter out "trace" level messages if they don't want to see those.

[kubkon]

cc @ling1726, will be of interest to you. We can in fact pair on this if you want.

[Hotell]

something standard like https://www.npmjs.com/package/debug should do the job quite well and without hard effort.

[kenotron]

@hotell, do you have a strong opinion here about debug as a lib? I was going to use whatever npm was using (npmlog?).

[kenotron]

Update: I'm very interesting in contribution here to move to using "debug".