Add directory and file save

[thomasrockhu]

Adding some functionality from the bash script and exposing it here. In particular

• specifying a directory to search for coverage reports
• specify a path to save down the coverage report sent to Codecov before uploading

[codecov]

Codecov Report

Merging #90 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #90   +/-   ##
=======================================
  Coverage   87.50%   87.50%           
=======================================
  Files           2        2           
  Lines          16       16           
  Branches        2        2           
=======================================
  Hits           14       14           
  Misses          2        2           

Flag	Coverage Δ
#unittest	87.50% <ø> (ø)

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