Implement and test copy and deepcopy

[jtv8]

Closes #6

[codecov]

Codecov Report

Merging #31 into master will increase coverage by 2.31%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   83.19%   85.50%   +2.31%     
==========================================
  Files          31       31              
  Lines         476      483       +7     
==========================================
+ Hits          396      413      +17     
+ Misses         80       70      -10     

Flag	Coverage Δ
#unittests	85.50% <100.00%> (+2.31%)	⬆️

Impacted Files	Coverage Δ
wysdom/dom/DOMDict.py	100.00% <100.00%> (ø)
wysdom/dom/DOMList.py	75.00% <100.00%> (+5.55%)	⬆️
wysdom/dom/DOMObject.py	84.48% <100.00%> (+10.34%)	⬆️

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