remove "logged in as"

Of course this still doesn't fix the undesirable header behavior
when the username display flows below the buttons (but the window
isn't narrow enough to trigger collapse), but it makes the
undesireable behavior somewhat less likely to show up in use??
Suboptimal.
category links to reading tab, rather than separate view
differentiates reader and subscription show pages
dependent destroy
begins category management page

introduces jQuery UI, drafts page elements
functional category management
growl on category change
new categories on category management page

(However, adding more than one category from the same page doesn't
work correctly yet.)
removes obsoleted category management facilities