Each controller for the viewer template must now define a
shouldShowAnnotation method that accepts an annotation id and determines
whether it should be displayed. This moves the logic out of the template
and into the controllers.

Lots of changes to massively simplify things and make them much more
performant.

- The thread directive gets a few changes
  - Cleared up confusing tuple unpacking in favor of named properties
    in the render queue as per the suggestion of @aron
  - The replies and annotation are set at once. Since the replies in
    turn render lazily, this should be fast enough for all but an
    unwieldy number of threads. If we hit that wall, we'll have to do
    some filtering / pagination.
  - The directive is now triggered only on attributes and parses the
    attribute value to get the thread
- The threads are rendered from a single thread root rather than using
  a global list of annotations that must be watched for its threads to
  be extracted. This results in a huge performance gain because this
  thread container has a stable set of children.
  - When the first `annotationsLoaded` callback arrives, we set a new
    root from the result of asking the threading plugin to thread them
  - Lots of hackery during store reloads goes away because we just nuke
    the thread root and reload
- The application controller does not have to modify a root annotation
  set at all anymore
- Use of the root scope in the controllers goes away entirely
- The ongoing edit is now stored in the scope again so that it can be
  be pinned to the top of the thread list
- The editor view and controller go away completely because the top
  level edit is now pinned to the top of the list, removing the need
  to re-render annotations between editing and viewing
- The selected annotations are now a hash of annotation ids to true
  values if the annotation is selected, or null if the selection is
  empty
- An ng-show is used to show/hide the selected/unselected annotations,
  further reducing re-renders
- The view state is gone complete and now there is only sort
- The sort is not applied programmatically in the controller, but a
  simple watch on the name of the sort is used to set the predicate
  and reverse settings as scope properties that feed into an orderBy
  filter on the thread list, reducing the number of extra watches we
  have to do and further reducing the code
- The sort is no longer an animated dropdown, but sits at the top of
  the list always (I assume we can style this better, so have at it)
- Unnecessary helper and logging functions are removed from the
  annotator service because silence is golden

Bring the view and sort controls closer in line with the latest
design decisions.

- Start in Document view and Location sort.
- When in Document view and Location sort, use dynamic bucket.
- When in any sort other than location, disable dynamic bucket.
- When in Location sort, all comments always appear at the bottom.
- Remove the Screen and Comment views.
- Remove the focus annotation state that was triggered by expanding
  a top level annotation; there is only hover emphasis now.
- The `showViewer` call always goes to Selection view.
- Using multi-select (Cmd or Ctrl Click on tabs and highlights) will
  trigger the Selection view, or switch back to the Document view
  if the selection is empty.
- Page search always searches the whole document.
- Leaving the page search switches back to the Document view.

Additionally, many cleanups were made as a result.

- No need to track focused state or comments in the client frames.
- No need to pass the view name in `updateViewer` or `showViewer`.
- No need to pass the focus purpose in `updateViewer`, `showViewer`,
  or `toggleViewerSelection`.
- Drop various helper functions around focus.
- No need to manually unshift or push newly created or streamed
  annotations into the view.
- The viewer template uses threads at the top repeater, like the
  page search template.
- The app controller maintains all the annotations on the root scope,
  the current selection shadowing it on the application scope, and
  a cheap, identity watch that retreives the threads.
- The page search can use a cheap watch on the threads to refresh.
- The reply list of each annotation is no longer set on the annotation
  object.
- The thread directive now watches the thread children and keeps them
  sorted, rather than the annotation directive.
- The recursive `buildReplyList` function is no longer needed.
- Scattered use of the root scope is much reduced.
- Drop requestAnimationFrame polyfill because angular has its own.
- Drop the recursive directive, splitting out thread.html and using
  using ng-include for recursion.
- Use a single render queue for all threads and sequence updates on
  animation frames, resulting in smooth, progressive rendering.
- Combine the viewer and page_search templates.

This reverts commit f8107e08c4f89fe41a2825693225609bcd5e17b4.

Don't read the parent when sending stream updates

When reloading the application, call the destroy methods to unbind
an event handlers, etc.

The Angular parser isn't expressive enough to handle anything but a
subset of ASCII so it's not suitable for pushing arbitrary JSON data
into the scope via ng-init. We'll have to do something else. For now,
remove it because it was just premature optimisation.

Remove source map code from vendor files

Fix error when pressing delete in empty tag field

This removes a huge dump of console warnings as the browser tries and
fails to request the map files.

Pressing backspace in the tags input still calls the removeTag handler.
This results in an exception when scope.model.tags was undefined. Now
we check for a tag and the tags array before updating.

Remove web fonts

Now using Helvitica Neue/Arial and Georgia over Open Sans and
Merriweather to reduces the size of the application payload and increase
loading times. The fonts themselves were not adding much to the overall
experience.

Convert coffee files in scripts/vendor to js, modify scripts/vendor/.gitignore

Added trivial change section

Configure updater for standalone page.

An annotation standalone page should only listen to news from
the showed annotation and its replies. This has been lost in the
our series of refactoring.

Now it is restored.

Fix #1427

Remove the util service

Move removeQuoteCharacter into an inner function of _tokenize()

This is now consistent with the formHelpers file. The baseURI method
is now available on the documentHelpers object.

Also fix a snake_case to camelCase conversion

Add ltr direction to our top injected elements.

Otherwise our text flow is broken at rtl pages.
Also remove a superfluous rule

Immediately refresh viewer for live-updates

Our applyUpdates() puts/deletes annotations into the viewer.
But for the stream page, because there was no scope digest cycle
it seemed that the UI was reacting very slow to show the annotations.

This one-liner just creates a digest cycle in these scenarios.
The user experience is a magnitude better with this in the stream page

Fix #1455

Delete NotificationController

It doesn't seem to be used anywhere...

This brings it inline with the helpers.coffee, and now uses .factory
instead of .service to register the object.

Remove display: run-in from thread indicators

Improve padding on #home page

Remove hover state on tabs

Small tweaks and fixes to the styled-text module

All sheet tabs now have a bottom border