NSQ roadmap post

cc @mccutchen
The transition to this section is a little awkward to me.  What if you moved the Summary above into this section, at the end of this introductory material (just before the "Gossip" header).

> Above, I outlined three high level opportunities for improvement:
>  1. **Discovery** — …
>  2. …
>
> Now I'd like to talk about specific approaches for making those improvements…

Something along those lines.  I think having the 3 high level areas to improve closer to the more specific implementation proposals would be nice.