Add persist_defaults param to UserProperty

[jtv8]

Closes #43
Closes #44

[codecov]

Codecov Report

Merging #45 into master will increase coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #45      +/-   ##
==========================================
+ Coverage   90.17%   90.29%   +0.12%     
==========================================
  Files          30       30              
  Lines         529      536       +7     
==========================================
+ Hits          477      484       +7     
  Misses         52       52              

Flag	Coverage Δ
#unittests	90.29% <100.00%> (+0.12%)	⬆️

Impacted Files	Coverage Δ
wysdom/__version__.py	100.00% <100.00%> (ø)
wysdom/user_objects/UserProperty.py	94.11% <100.00%> (+1.52%)	⬆️

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