Nested patterns

[zaibacu]

Partially closes: #70 (nesting works, operators are ignored)

[codecov]

Codecov Report

Merging #96 into master will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #96      +/-   ##
==========================================
+ Coverage   92.90%   93.01%   +0.11%     
==========================================
  Files          13       13              
  Lines         691      702      +11     
  Branches      121      126       +5     
==========================================
+ Hits          642      653      +11     
  Misses         34       34              
  Partials       15       15              

Impacted Files	Coverage Δ
rita/engine/translate_spacy.py	85.71% <100.00%> (+0.23%)	⬆️
rita/engine/translate_standalone.py	92.15% <100.00%> (+0.07%)	⬆️
rita/preprocess.py	98.73% <100.00%> (+0.07%)	⬆️

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