Not every browser supports "Vary: Accept" so it's not a good idea
to try to serve the HTML of the app on the same path as the JSON
endpoint used for syncing the dynamic application state.

For some reason, only in the Chrome extension, this was generating
URLs like /logout instead of /app/logout. Investigate later.

Cleans some more resource, view, controller stuff up with it.

- Listen to events for setting the user object after registration
  and login. This change reduces the amount of horus code duplicated
  by the AppController through integration with our enhanced user
  request property.
- Add response helpers to the AppController to even further reduce
  the amount of code duplicated from horus. So simple now!
- Keep the {flash, model} structure of the app's main JSON view
  known only to the view callable, not the resource. The resource is
  just the model now.
- Stop all that silly reifying
- Upgrade our flash message system to handle the FlashMessage class
  from bag.pyramid.flash_msg.
- Tweak some messages slightly.
- Change the way the app is created. First, load the modules which
  integrate with horus: forms, models, and schemas. Then, load horus
  itself. Finally, include all of h.

This reverts commit 8185d55cd6e3261d360bd88eea37845bfdc13b3d.

These styles were necessary for distinguishing which things show up
on the summary. We lost timestamps and reply counts with this change.

Nice trick here -- by using the hover state we hopefully ensure that
it's hard to activate a menu that gets cut off by the overflow.

This is a little bit ugly, but it makes multiple font icon mixins
override one another, which is helpful for things like custom dropdown
icons.

When an icon font element is empty, it contains no spacing. Otherwise,
use the space character I added in a previous commit, to automatically
add a single space between the icon and the text.

...and give the dropdown a consistent active icon

Fixes the color and position.

more margin between controls

Easy fix for bug #352

We were using header tags for the annotation user name and time for
which we mangled the typography to fit this use. This restores the
suggested UA styles for header elements and reworks the annotation
user line to fit the way it was before.

In addition, the time is moved up to the top line.