Adding on to #111

[klauer]

• Adds basic tests of grammar changes
• Merges with master
• Adds some more blark.summary coverage

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.45238% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.4%. Comparing base (86f9df8) to head (5e599ca).

Files with missing lines	Patch %	Lines
blark/summary.py	87.8%	10 Missing ⚠️
blark/util.py	94.1%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #116     +/-   ##
========================================
+ Coverage    81.5%   82.4%   +0.9%     
========================================
  Files          27      27             
  Lines        5836    5897     +61     
========================================
+ Hits         4757    4862    +105     
+ Misses       1079    1035     -44     

Files with missing lines	Coverage Δ
blark/plain.py	83.3% <100.0%> (ø)
blark/solution.py	84.3% <100.0%> (+<0.1%)	⬆️
blark/tests/test_summary.py	99.0% <100.0%> (+0.2%)	⬆️
blark/tests/test_transformer.py	95.0% <100.0%> (+0.2%)	⬆️
blark/transform.py	98.4% <100.0%> (-0.1%)	⬇️
blark/util.py	85.1% <94.1%> (+0.3%)	⬆️
blark/summary.py	84.2% <87.8%> (+4.3%)	⬆️

... and 6 files with indirect coverage changes

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