WIP: Pybay20 code

[kurtbrose]

probably never merge

[codecov]

Codecov Report

Merging #187 into master will decrease coverage by 0.26%.
The diff coverage is 68.57%.

@@            Coverage Diff             @@
##           master     #187      +/-   ##
==========================================
- Coverage   98.93%   98.67%   -0.27%     
==========================================
  Files          26       27       +1     
  Lines        4052     4087      +35     
  Branches      575      582       +7     
==========================================
+ Hits         4009     4033      +24     
- Misses         20       31      +11     
  Partials       23       23              

Impacted Files	Coverage Δ
glom/test/demo_test.py	68.57% <68.57%> (ø)

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