Format thread timestamps
This element is constant, so let's bootstrap it
bootstrap tags input
Refactor components for the main content section

Each conversation views now manages its own separate elements
rather than all binding to a shared #conversation element, and
similarly for message composition ui.

Also includes the beginnings of group creation UI (not working yet),
featuring bootstrap-tagsinput field for entering group recipients
Get single recipient message composition working again
Fix some markup issues

* Remove spurious search div
* Fix nested uls
* Use class name selected, not closed (the inverse)
* Restor nacl div
Get overflow scrolls working

Had to resort to a resize event handler.
A bit slow at times, but it works.
remove extra insertion, it's already happening
Rm old css
use new index page for popup