release 0.5.12

[chfw]

1. minor code refactoring
2. include tests and docs for OpenSuse. Include tests in source tarballs #60 python setup.py test does nothing #61

[codecov-io]

Codecov Report

Merging #62 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   97.14%   97.14%   -0.01%     
==========================================
  Files          42       42              
  Lines        3050     3045       -5     
==========================================
- Hits         2963     2958       -5     
  Misses         87       87

Impacted Files	Coverage Δ
pyexcel_io/readers/tsvz.py	100% <ø> (ø)	⬆️
pyexcel_io/writers/tsvz.py	100% <ø> (ø)	⬆️
tests/test_renderer.py	100% <ø> (ø)	⬆️
pyexcel_io/utils.py	100% <ø> (ø)	⬆️
tests/test_new_csv_book.py	100% <100%> (ø)	⬆️
pyexcel_io/writers/csvz.py	100% <100%> (ø)	⬆️
pyexcel_io/plugins.py	95.16% <100%> (ø)	⬆️
tests/test_issues.py	92.23% <100%> (ø)	⬆️
tests/test_filter.py	100% <100%> (ø)	⬆️
tests/test_book.py	100% <100%> (ø)	⬆️
... and 17 more

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