Particle Gibbs with ancestor resampling (#32)

* PG AS - rough draft

* Correct resampling

* PG AS - rough draft

* Correct resampling

* Update log weights

* Format

* Bad merge

* RNG

* Add example to docs

* Add sample script

* Fix rng split edge case, unify model interface, comments from @yebai

* rudimentary tests for pg-as

* Fix @devmotion comments

* Format, need a precommit ...

* Simplify rng handling

* Tests, names

* Fix reference seed hack

* Comment

Author: FredericWantiez

Project.toml

@@ -1,7 +1,7 @@
 name = "AdvancedPS"
 uuid = "576499cb-2369-40b2-a588-c64705576edc"
 authors = ["TuringLang"]
-version = "0.4"
+version = "0.4.0"
 
 [deps]
 AbstractMCMC = "80f14c24-f653-4e6a-9b94-39d6b0f70001"