Flesh out conjugacy testing

[axch]

Sampler agreement

• [ ] Collapsed vs uncollapsed multivariate normal (need to take 1-D marginals, presmably)
• [ ] Collapsed vs stick-breaking forms of Chinese Restaurant Process

Write and test non-conjugate bulk assessment for

• [ ] Multivariate normal
• [ ] Dirichlet categorical
• [ ] Symmetric dirichlet categorical

Gibbs sampler

• [ ] Collapsed multivariate normal