WIP: feature/improve-code-quality

[KennethanCeyer]

features

• improve code-climate, codefactor grade score
• reduce all code lines
• set all code convention
• add test code
• update all dependencies
• update version to pg-calendar
• update readme.md

[codecov]

Codecov Report

Merging #85 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #85   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines         320    306   -14     
=====================================
- Hits          320    306   -14

Impacted Files	Coverage Δ
src/js/tests/requirejs.config.js	100% <ø> (ø)	⬆️
src/js/component/classNames.spec.js	100% <100%> (ø)	⬆️
src/js/component/helper.js	100% <100%> (ø)	⬆️
src/js/component/classNames.js	100% <100%> (ø)	⬆️
src/js/component/models.spec.js	100% <100%> (ø)	⬆️
src/js/component/models.js	100% <100%> (ø)	⬆️
src/js/manager/index.js	100% <100%> (ø)	⬆️
src/js/manager/index.spec.js	100% <100%> (ø)	⬆️
src/js/component/helper.spec.js	100% <100%> (ø)	⬆️
... and 2 more

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[coveralls]

Coverage decreased (-0.3%) to 99.398% when pulling 3d1a13b on feature/improve-code-quality into 78d17b1 on master.