use versioneer for version management

[orbeckst]

• fix #87
• add versioneer with proper configuration for test coverage
• add a small test for the new propka.__version__ attribute
• make docs automatically use the version
• fixed omitted author in docs

[codecov[bot]]

Codecov Report

Merging #88 into master will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
- Coverage   72.40%   72.39%   -0.01%     
==========================================
  Files          25       24       -1     
  Lines        4142     4141       -1     
==========================================
- Hits         2999     2998       -1     
  Misses       1143     1143              

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[sobolevnrm]

@orbeckst - this looks great. Do you want to do the merging honors? :)

[orbeckst]

Sure, happy to :-).