adding make clean before build

[scarrazza]

Forces clean before build. @andrea-pasquale could you please give a try?

[codecov]

Codecov Report

Merging #22 (4e75a86) into tf28 (636bbee) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              tf28       #22   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          528       528           
=========================================
  Hits           528       528           

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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[andrea-pasquale]

Thanks for this implementation.
On my machine it is working, I did a check in a previous env which was giving me the abort and now it is working fine.

[stavros11]

I also tried installing with pip install -e . in two different enviroments and tests works in both without having to recompile.