This fixes an issue with floated columns failing to clear each other
when of different heights. We now use a flexbox implementation taken
from the Pure CSS grid system which fixes the whitespace inconsistencies
in Safari.

This works around the nasty hacks involved in removing the whitespace
between inline-block elements without having to use comments or
negative letter/word spacing.

This does mean we can't do centered or right aligned grids very easily
at the moment. If we need these things in future we can reconsider.

This replaces the YUI module we had before and implements only the parts
of the system that we need at the moment leaving a far cleaner and more
readable api.

It's not currently used anywhere and we could do with a cleaner grid
implementation.

Username blacklist

Drop pyramid_deform and horus HTML views.

Firefox and IE apply the focus pseudo class to anchors when clicked.
This prevents our toggle button returning to it's natural state after
it has been clicked. This change blurs the element on mouseup to ensure
that:

 1) The focus state is removed when clicked.
 2) The focus state remains when using the enter key to trigger the
    toggle (also triggers a click event). Otherwise the user would lose
    the focused UI element when navigating with a keyboard.

It was originally only applied on hover and was causing display
inconsistencies in FF/IE where the toggle would turn red.

Fixes #1567

Close #1552

Remove info notification when closing the auth window

Separate session/helpers bundles, tweak bundling

Fix icon conflicts

Hide tags in collapsed reply threads

Close #1412

This will reduce the chance of styles bleeding in from the parent
document.

Previously this generated a large amount of invalid unused css due to
nesting pseudo classes.

This allows the icon name to be changed freely without having to
update unrelated markup or stylesheets.

This should reduces the chances of style conflicts when annotator
content is injected into a host site. This pull request also ensures
all icons use the private use area of the unicode range[1].

[1]: http://en.wikipedia.org/wiki/Private_Use_Areas

Tweak the way we organize our asset bundles for fewer output files,
straightforward names, and no conflict of dev and prod output files.

- Break session and helpers into their own bundles.

- Bundle vendor libs up where they are not common to more than one
  optional component. For example, angular-bootstrap is only needed by
  helpers since that is where we now redefine tabbable and create
  the tab-reveal directive (in a new helpers/ui-helpers.coffee file).
  Another example is angular-resource, which is only used by the session
  bundle. On the other hand, angular-route is used by the app, but soon
  also by the auth bundle as soon as we unify all the login forms and
  boot out deform.

- Inline icomoon.css.

- Rename some outputs:
  - hypothesis-app.{css,js} -> app.{css,js}
    This is the main site application.
  - hypothesis-inject.{css,js} -> hypothesis.{css,js}
    This is the inject script.

Close #1555
Related to webplatform/notes-server#13

Fix search on standalone pages

Using the searchbar will perform a stream search

Fix #1494

Extensible link and meta tags in base template

Auth isolation

Limit the markdown toolbar for tight spaces