Changed positioning on topbar to fixed on the streams page. It's much more consistent with design on feed-type sites like Facebook and Twitter.

See #1020 for a description of the problem.

This commit patches the merge behavior of the bridge plugin:
never update a list of targets with a shorter list.
(This avoids it being zeroed by accident.)

This does not really solve the more generic problem: the race condition
of the messages moving on the bridge. We should either do some
time-stamping, or some other smarter flow control...

Fix #575

Changed how threading works.

Conflicts:
	h/js/services.coffee

Updated Annotator TextHighlights plugin to  c90ac7cd (typed packaging branch), with performance improvements

Fixes #972

Fixed bug where the wrong icon would show marking an annotation as private. 

Because of that many load top annotation labels were missing.

Fixes #948

After login/logout if there were search results, they were not displayed again. Now a new event is broadcasted to which the SearchController listens to and calls the refresh() again.
Currently it is done with a timer. The most elegant solution would be having an event about loading and anchoring all annotations and after that we could call this event properly.

Fixes #959

Made a slight mistake in my Iconwork PR. This fixes it. On private annotations the wrong icon was showing.

Updated icons for toolbar. Cleaned up Icomoon session file to reduce its size.

Updated icons for toolbar. Cleaned up Icomoon session file to reduce its size and bring it up to date with the newest version of the Icomoon app.

 * Updated dom-text-mapper to 3fb30bee (master branch)
 * Updated Annotator to 631c1345 (typed-packaging branch)

These are all internal DTM / Annotator changes.
The communcation about DOM changes has migrated from method calls
to events.

See also https://github.com/hypothesis/dom-text-mapper/issues/14

When hovering the mouse over a visible highlight, add a drop shadow to the annotation card in the sidebar.

Fixes #918.
Also fixes #957.

 * Updated Annotator to 3d4ae840 (typed-packaging branch).
   In this version, the `noDocAccess` option has been removed.
 * Added the required (noop) overrides to regain the same functionality

Also did some cosmetical changes.

Fixes #953.

 * Update Annotator to bbad33fe (typed-packaging branch),
   which has some adder-related tweaks/fixes.
   (More sane encapsulation of the `canAnnotate` behavior,
   following suggestions from @gergely-ujvari)
 * Copy Annotator's changes to our overrides:
   * In `onAdderClick()`, set `inAdderClick`
   * In `onSuccessfulSelection()`, return false when annotating is forbidden
 * Upon building the channels between the guest and sidebar,
   synchronize the enableAnnotating state.

Really fixes #949.

 * Update Annotator to dd6f102d (typed-packaging branch)
   * Several internal fixes, tweaks and cosmetic changes
     (Now it's fully functional in Stand-alone mode, again.)
 * Follow Annotator API changes
   * `noMatcing` option renamed to `noDocAccess`
   * `ignoreMouseUp` option renamed to `canAnnotate`,
      and the semantics got inverted
 * The bridge plugin now propagates the 'enableAnnotating' events
 * Added an `isEmpty` method to the draft service
 * When editing/replying/canceling/saving in the sidebar,
   enable/disable annotating.

Fixes #949

 * Add support for activating/deactivating HLs in batch mode
 * Cosmetic changes (change the names of some doc access strategies)

Fixes #807.