when highlighting one comment, scroll to it

though i wonder with highlighting comments and now scrolling to
them, why we bother excluding all other threads.  we aren't
pagingating threads anyway.
Test-user receives message after registering banned username
Create user model tests for is_active, unban, is_banned and is_new
Merge pull request #108 from abutler3/master

add tests for recent changes to User model
optimize database queries for "Your Threads" page
fix DOM structure when replying to or updating comments
rebuilt comment tree DOM structure as valid HTML
use standard create/update comment routes