Build repo groups

[kkaefer]

It'd be cool to create groups of repositories, similar to the Everything/Participating lists, except with a user-curated list of repositories.

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[bkeepers]

I'd love to add something like this in the proposed filters api in #131. Basically, as part of a filter you could limit it to an organization or specific repositories.

Would that suffice?

[kkaefer]

Yup, sounds perfect

[ljbade]

+1