Use standard-library logging for verbose logging

[EpicWink]

Instead of print - allows for more configurability by the user

[bwoodsend]

Hmm, I'm rather reluctant to make logging part of pyfqmr's import footprint/startup time impact. I'd rather just say if you want something other than print then set verbose to false and do it yourself. (Well, really I wish the verbose option didn't exist but hey ho...)

[EpicWink]

Oh, in that case the import can be moved to inside if verbose: (I have to test whether Cython supports this).

[bwoodsend]

Thanks for these changes @EpicWink. Sorry for the rather slow/bikesheddy/not really with it/abrasive reviews.

I'll try and hit the release button in a few days (hopefully after #34 goes in).

[EpicWink]

No worries, all valid concerns