Improve access to jsonschema validation and document DOM functions

[jtv8]

Closes #11

[codecov]

Codecov Report

Merging #28 into master will increase coverage by 1.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #28      +/-   ##
==========================================
+ Coverage   80.83%   82.02%   +1.19%     
==========================================
  Files          31       31              
  Lines         480      484       +4     
==========================================
+ Hits          388      397       +9     
+ Misses         92       87       -5     

Flag	Coverage Δ
#unittests	82.02% <100.00%> (+1.19%)	⬆️

Impacted Files	Coverage Δ
wysdom/__init__.py	100.00% <100.00%> (ø)
wysdom/__version__.py	100.00% <100.00%> (ø)
wysdom/dom/__init__.py	100.00% <100.00%> (ø)
wysdom/dom/functions.py	100.00% <100.00%> (ø)
wysdom/object_schema/SchemaObject.py	100.00% <0.00%> (+5.88%)	⬆️
wysdom/base_schema/Schema.py	84.61% <0.00%> (+7.69%)	⬆️
wysdom/object_schema/SchemaArray.py	100.00% <0.00%> (+7.69%)	⬆️
wysdom/base_schema/SchemaPrimitive.py	100.00% <0.00%> (+8.33%)	⬆️
wysdom/base_schema/SchemaType.py	90.00% <0.00%> (+10.00%)	⬆️

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