Updates on Tracis-CI config and Tox

[joaomcteixeira]

• Implemented Travis-CI for Windows, MacOSX and Linux
  • for Python: 3.6, 3.7 and 3.8
  • all previous without using anaconda expect for MacOSX 3.8
  • I have nothing against Anaconda ;-), on the contrary, I use it everyday.
• Improved tox.ini workflow to my current favorite standards.
  • removed cover and nocov envs. Considers only coverage
  • report is performed directly on the testenvs
• Implemented mock strategy to avoid installing dependencies for documentation generation.
  • TOXENV docs

[codecov-io]

Codecov Report

Merging #3 into latest will decrease coverage by 66.66%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           latest   #3       +/-   ##
=======================================
- Coverage   66.66%   0%   -66.67%     
=======================================
  Files           5    5               
  Lines          15   17        +2     
  Branches        1    0        -1     
=======================================
- Hits           10    0       -10     
- Misses          5   17       +12

Impacted Files	Coverage Δ
src/amodule.py	0% <0%> (-100%)	⬇️
src/sampleproject/__init__.py	0% <0%> (-100%)	⬇️
src/sampleproject/libs/samplemodule.py	0% <0%> (-100%)	⬇️

---

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[codecov-io]

Codecov Report

Merging #3 into latest will increase coverage by 10.25%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           latest       #3       +/-   ##
===========================================
+ Coverage   66.66%   76.92%   +10.25%     
===========================================
  Files           5        4        -1     
  Lines          15       13        -2     
  Branches        1        0        -1     
===========================================
  Hits           10       10               
+ Misses          5        3        -2

Impacted Files	Coverage Δ
src/sampleproject/__main__.py	0% <0%> (ø)	⬆️
src/sampleproject/libs/samplemodule.py	100% <0%> (ø)	⬆️
src/amodule.py

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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