Support for 'include' context - only include given properties

[BowlOfSoup]

See #72 for more detail.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 93.65079% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.39%. Comparing base (430b516) to head (c23eae5).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Service/Normalize/AbstractNormalizer.php	92.59%	2 Missing ⚠️
src/Service/Normalize/MethodNormalizer.php	83.33%	2 Missing ⚠️
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Additional details and impacted files

@@              Coverage Diff              @@
##              master      #73      +/-   ##
=============================================
- Coverage     100.00%   99.39%   -0.61%     
- Complexity       287      299      +12     
=============================================
  Files             19       19              
  Lines            628      663      +35     
=============================================
+ Hits             628      659      +31     
- Misses             0        4       +4     

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