Update the UserDetail description to pull from bio
Update the UserDetail description to pull from bio

- If bio exists, use it. Truncate at 160 dropping incomplete ending words.
- If bio, but no name: See 's work on Ello <@username>
- If no bio and no name: See <@username>'s work on Ello

[#126717975](https://www.pivotaltracker.com/story/show/126717975)

ello/webapp,ello/webapp,ello/webapp