Issue 5 use references when building json schemas to avoid infinite recursion

[jtv8]

Closes #5
Closes #29
Closes #32
Closes #35

[codecov]

Codecov Report

Merging #33 into master will increase coverage by 2.70%.
The diff coverage is 94.66%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   85.50%   88.21%   +2.70%     
==========================================
  Files          31       30       -1     
  Lines         483      509      +26     
==========================================
+ Hits          413      449      +36     
+ Misses         70       60      -10     

Flag	Coverage Δ
#unittests	88.21% <94.66%> (+2.70%)	⬆️

Impacted Files	Coverage Δ
wysdom/base_schema/SchemaNone.py	100.00% <ø> (ø)
wysdom/base_schema/SchemaType.py	90.00% <ø> (ø)
wysdom/dom/DOMDict.py	80.95% <ø> (-19.05%)	⬇️
wysdom/dom/DOMList.py	69.01% <ø> (-5.99%)	⬇️
wysdom/mixins/ReadsJSON.py	100.00% <ø> (ø)
wysdom/mixins/ReadsYAML.py	100.00% <ø> (ø)
wysdom/mixins/RegistersSubclasses.py	74.07% <66.66%> (+14.07%)	⬆️
wysdom/__init__.py	100.00% <100.00%> (ø)
wysdom/__version__.py	100.00% <100.00%> (ø)
wysdom/base_schema/Schema.py	92.59% <100.00%> (+5.92%)	⬆️
... and 11 more

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