Support continuous integration

[lenosi]

Continues integration with Travis.CI

• flake8
• tests Python 3.7
• tests Python 3.6
• pep8 fixes

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@1473290). Click here to learn what that means.
The diff coverage is 32.5%.

@@            Coverage Diff            @@
##             master       #3   +/-   ##
=========================================
  Coverage          ?   57.56%           
=========================================
  Files             ?       13           
  Lines             ?      502           
  Branches          ?        0           
=========================================
  Hits              ?      289           
  Misses            ?      213           
  Partials          ?        0

Impacted Files	Coverage Δ
...ter/adapters/polarion/args/polarion_args_parser.py	28.2% <ø> (ø)
src/fmfexporter/fmf_adapter.py	62.65% <ø> (ø)
...xporter/adapters/polarion/utils/polarion_config.py	100% <ø> (ø)
...exporter/adapters/polarion/fmf_adapter_polarion.py	67.85% <ø> (ø)
...fmfexporter/adapters/polarion/polarion_reporter.py	54.54% <ø> (ø)
src/fmfexporter/args/args_parser.py	0% <0%> (ø)
src/fmfexporter/__init__.py	100% <100%> (ø)
src/fmfexporter/fmf_testcase.py	92.4% <100%> (ø)
src/fmfexporter/adapters/__init__.py	100% <100%> (ø)
...mfexporter/adapters/polarion/polarion_test_case.py	65.89% <15.38%> (ø)
... and 1 more

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