Cover more priors with empirical distribution extension function

[AaronDJohnson]

Reopen #180 which was closed on accident.

[codecov-commenter]

Codecov Report

Merging #184 (ca633f4) into master (b7b90e5) will increase coverage by 1.31%.
The diff coverage is 45.83%.

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
+ Coverage   37.06%   38.37%   +1.31%     
==========================================
  Files          20       20              
  Lines        3899     4253     +354     
==========================================
+ Hits         1445     1632     +187     
- Misses       2454     2621     +167     

Impacted Files	Coverage Δ
enterprise_extensions/empirical_distr.py	73.86% <ø> (ø)
enterprise_extensions/sampler.py	38.40% <45.83%> (-0.64%)	⬇️
enterprise_extensions/deterministic.py	11.83% <0.00%> (ø)
enterprise_extensions/models.py	43.79% <0.00%> (+2.58%)	⬆️
enterprise_extensions/blocks.py	47.86% <0.00%> (+3.73%)	⬆️

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