Various cleanup

[wsanchez]

This change is 

[codecov-io]

Codecov Report

Merging #40 into master will decrease coverage by 1.71%.
The diff coverage is 97.42%.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
- Coverage     100%   98.28%   -1.72%     
==========================================
  Files          15       23       +8     
  Lines         258      582     +324     
  Branches        5       11       +6     
==========================================
+ Hits          258      572     +314     
- Misses          0        9       +9     
- Partials        0        1       +1

Impacted Files	Coverage Δ
src/sample_klein_app/version.py	100% <ø> (ø)	⬆️
...rc/sample_klein_app/application/test/test_hello.py	100% <100%> (ø)	⬆️
src/sample_klein_app/application/hello.py	100% <100%> (ø)	⬆️
src/sample_klein_app/ext/klein.py	100% <100%> (ø)
...ample_klein_app/application/test/test_composite.py	100% <100%> (ø)	⬆️
src/sample_klein_app/application/test/__init__.py	100% <100%> (ø)
src/sample_klein_app/ext/test/test_json.py	100% <100%> (ø)
src/sample_klein_app/ext/__init__.py	100% <100%> (ø)
src/sample_klein_app/application/test/test_math.py	100% <100%> (ø)	⬆️
src/sample_klein_app/application/__init__.py	100% <100%> (ø)
... and 23 more

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