Support AD via Zygote (WIP).

[tpapp]

No description provided.

[codecov]

Codecov Report

Merging #24 into master will increase coverage by 4.81%.
The diff coverage is 33.33%.

@@           Coverage Diff           @@
##           master   #24      +/-   ##
=======================================
+ Coverage   85.18%   90%   +4.81%     
=======================================
  Files           4     5       +1     
  Lines          81    90       +9     
=======================================
+ Hits           69    81      +12     
+ Misses         12     9       -3

Impacted Files	Coverage Δ
src/LogDensityProblems.jl	97.87% <100%> (+8.74%)	⬆️
src/AD_Zygote.jl	25% <25%> (ø)
src/AD_ReverseDiff.jl	100% <0%> (+12.5%)	⬆️
src/AD_Flux.jl	85.71% <0%> (+14.28%)	⬆️
src/AD_ForwardDiff.jl	95% <0%> (+15%)	⬆️

---

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[coveralls]

Pull Request Test Coverage Report for Build 102

• 3 of 9 (33.33%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+6.1%) to 89.888%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/AD_Zygote.jl	2	8	25.0%

Totals
Change from base Build 96:	6.1%
Covered Lines:	80
Relevant Lines:	89

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 102

• 3 of 9 (33.33%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+6.1%) to 89.888%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/AD_Zygote.jl	2	8	25.0%

Totals
Change from base Build 96:	6.1%
Covered Lines:	80
Relevant Lines:	89

---

💛 - Coveralls

[tpapp]

PR should be dusted off for new API, or rewritten from scratch.

[tpapp]

Closing in favor of #40.