Verbosity option + logging

[osma]

No description provided.

[codecov]

Codecov Report

Merging #69 into master will increase coverage by 0.27%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage    95.8%   96.07%   +0.27%     
==========================================
  Files          27       27              
  Lines         881      917      +36     
==========================================
+ Hits          844      881      +37     
+ Misses         37       36       -1

Impacted Files	Coverage Δ
annif/project.py	100% <100%> (ø)	⬆️
annif/__init__.py	100% <100%> (ø)	⬆️
annif/backend/tfidf.py	100% <100%> (ø)	⬆️
annif/cli.py	92.78% <70.83%> (+2.56%)	⬆️
annif/backend/backend.py	88.88% <85.71%> (-1.12%)	⬇️

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[coveralls]

Coverage increased (+0.3%) to 96.074% when pulling 641d326 on verbose-logging into ba70392 on master.