Implements working build status, code coverage.

[JoshuaHassler]

Adds base unit tests

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@4044e67). Click here to learn what that means.
The diff coverage is 73.33%.

@@            Coverage Diff            @@
##             master       #2   +/-   ##
=========================================
  Coverage          ?   64.85%           
=========================================
  Files             ?        8           
  Lines             ?      367           
  Branches          ?       57           
=========================================
  Hits              ?      238           
  Misses            ?      129           
  Partials          ?        0

Impacted Files	Coverage Δ
src/subscriber.cpp	59.52% <0%> (ø)
src/octopos.cpp	73.86% <50%> (ø)
tests/test_octopOS.cpp	85.71% <83.33%> (ø)

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