Rustdoc roadmap

[nrc]

Where are we at? Where are going?

[nrc]

See also this list of issues: https://gist.github.com/QuietMisdreavus/3c0702517bea40711ed9baf513971143

[steveklabnik]

I should note that I have milestones set up https://github.com/steveklabnik/rustdoc/milestones