Adds models for enrollments_by_day

[SoryRawyer]

Also includes:

• Updates to dbt_project.yml
• Two new dbt packages
  • dbt_utils: needed for dim_date
  • codegen: useful for generating model documentation
• Renaming README.md to README.rst for proper rendering
• Documentation for installing and running dbt in the README

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[SoryRawyer]

While I'm looking at the macros, I think it makes more sense to remove the get_event_attributes macro and defer pulling event attributes out of event_str until they're actually needed. It was a helpful exercise while getting started but I don't think it makes sense longer-term.

[Ian2012]

I know this is still in very early stages and that this will be run probably in background, a cronjob, a init job or in a tutor command, but can you leave testing instructions and a bit of documentation?

[SoryRawyer]

Absolutely! I will check in some additional documentation along with a requirements.txt. I have some thoughts about making setup a little easier but I was thinking of saving those updates for a PR that's more focused on documentation and setup.

[Ian2012]

@SoryRawyer Is there anything blocking this PR? Can you rename all commits or squash them into one?

[SoryRawyer]

@Ian2012 I don't think there's anything blocking this. I'll go ahead and squash my commits so they follow the conventional commit framework.

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