TODO

[jhelvy]

I'm just collecting some todo items here from existing issues:

• [ ] Write a function to handle encoding data with an outside good (#52).
• [ ] Revise encoding to handle effects-coded data (#46).
• [ ] Restrict WTP space scale parameter to only be log-normal or censored-normal to force positivity (see this comment).
• [ ] Revise how the number of draws is determined based on the model (see this comment and also this SO post).
• [ ] Integrate xlogit as an option for supporting large N draws and speed (#54)