Use logging module instead of print()

[blauertee]

The headline pretty much says everything.

Here is a short overview why.

[shawnanastasio]

Thank you for the report. You are correct that using logging would be preferable to the print statements currently used. I don't have the resources to work on this for a little while, but in the mean time if you or someone else is interested in submitting a PR I could look into merging that.