Add logging to the package

[abelsiqueira]

It would be nice to have logging (perhaps from the package logging?).

@lyashevska, as discussed, here is my commit with some prints: c33ee9c

[bart1]

I guess if reading multiple files we could add a progress bar there but that seems low priority, maybe close for now?

[abelsiqueira]

We can leave it open as it is desirable to have it. We just don't work on it until we have time.