Pattern library first run

Does what it says on the tin.

The difference is that, while both get to intercept and handle the
response, only the transform can change the result that updates the
resource instance.

In this way, it's not necessary to copy the response data onto the
scope anymore because the object is updated properly in place rather
than being updated with the wrapped response containing the csrf
token and flash messages and other parasession data.

It is now provided via the data-form-validate-error-class attribute.

 * Validate on "change" rather than submit. This prevents errors
   appearing when the user tabs in/out of an input.
 * Keypress updating of errors in place errors to immediately indicate
   to the user when they have fixed an error.

Add a temprorary hack as a directive triggered by the form-error-list
class which polyfills the `ngModelController` methods `$setTouched` and
`$setUntouched`.

The form styles and the directive both rely on the form-error-list
element being nested as a sibling of the field to which it relates.

From now on the form module should be used and extended.

This removes the background and borders from the button.

These new styles include labels by default and error styles. It also
gives a little more breathing room between form elements.

The buttons now have a more consistent hover/active state without the
glossy highlight and the disabled state looks disabled.

Starting with the form elements, the new view is available at
/dev/pattern-library and currently only shows form fields.

Update Annotor's PDF plugin to 9acc6554 (typed-packaging).

Remove useless Annotator source maps. Fixes #1341.

This change was necessary to adapt to updates of the PDF.js version
shipped with newer FF releases.

There were three small changes. Our code now works with both
the old version (currently used with Chrome) and the old version
(embedded in FF).

Turn the standalone page into the app

Close #427
Close #754

Fix quirks with show/hide on the search bar

This is a small consistency improvement which ensures that whenever the
search is cleared the input becomes invisible. Previously, this only
worked correctly on the sidebar. Now, it works everywhere, including
when navigating using the back button to get to the unfiltered stream.

Isolate static assets in h:static

Drop the icomoon directory, saving only selection.json. The rest is not
needed, and is regenerated from the .json by the icomoon app.

Drop the font icon declarations in base.scss and use the css generated
by icomoon.

Move everything to h:static/fonts.

The icomoon css is not in styles because it has "fonts" as a relative
url, and we want "../fonts".

There are a number of reasons to isolate the static assets into their
own directory.

- An edge case in Pyramid: https://github.com/Pylons/pyramid/pull/1377
- Make serving them with a reverse proxy safer by ensuring that no code
  or configuration lives beneath the static directory
- Cleanliness

To avoid a big move happening shortly after this, also rename some of
the asset subdirectories to close #1317.

- js -> scripts
- css -> stylesheets
- lib -> scripts/vendor
- lib/images -> images
- browser/chrome/js/background.js -> browser/chrome/background.js
- browser/chrome/public/js/destroy.js -> browser/chrome/public/destroy.js

Finally, the locale directory was totally busted. The annotator.po file
included is the defualt locale, and it should have been .pot. Since it
includes only the default strings, there's no reason to serve it. I've
stripped it and we'll reinstate it correctly later.

Close #1311