Move math out of distribution random methods#3509

Merged

twiecki merged 3 commits intopymc-devs:masterfrom

lucianopaz:random_wrap

Jun 7, 2019

Commits on Jun 6, 2019

Changed Triangular, TruncatedNormal, Rice and ZeroInflatedNegativeBinomial random method. The math operations between the distribution parameters was moved to _random, and all parameter broadcastin…
lucianopaz
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Added release notes
lucianopaz
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Fixed domain error in TruncatedNormal test
lucianopaz
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