Updated to Python 3

[giuseppe-carboni]

Automatic tests were setup, along with the code coverage.
Badges regarding passing tests, coverage and code quality were added to the README.rst file as well.

[codecov]

Codecov Report

Attention: Patch coverage is 79.54545% with 36 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (master@89cb406). Click here to learn what that means.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #137   +/-   ##
=========================================
  Coverage          ?   87.89%           
=========================================
  Files             ?       18           
  Lines             ?      818           
  Branches          ?        0           
=========================================
  Hits              ?      719           
  Misses            ?       99           
  Partials          ?        0           

Files	Coverage Δ
suricate/__init__.py	100.00% <100.00%> (ø)
suricate/api/__init__.py	100.00% <ø> (ø)
suricate/api/config.py	100.00% <100.00%> (ø)
suricate/api/main/__init__.py	100.00% <100.00%> (ø)
suricate/api/views.py	98.07% <100.00%> (ø)
suricate/configuration.py	100.00% <100.00%> (ø)
suricate/monitor/schedulers.py	100.00% <100.00%> (ø)
suricate/paths.py	100.00% <100.00%> (ø)
suricate/api/tasks.py	94.44% <66.66%> (ø)
suricate/component.py	89.23% <94.73%> (ø)
... and 6 more

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