- Updates jwz.js to ed442f8e510e3b656bb98fc1c3ec072b0aee61d4
  which include the fix for id scope that was already merged
  downstream, here, but also includes the removal of the underscore
  dependency.
- Remove underscore.js

Closes #310

Fixes #307

Closes #312

Fixes #74
Fixes #286

- It's important to always parse the result, even if there's no
  callback parameter, since it will cause a merge to happen.
- We shouldn't call the error callback if it doesn't exist.

Conflicts:
	h/assets.py
	h/js/inject/host.coffee
	h/js/services.coffee

- The drag events were not ported to jschannel.
- Incorporated fix (updated to the current HEAD) for issue #262 too

fixes some user agent border on the frame in Chrome.

Don't forget to upstream this!

Establish privacy and markdown directives. The reason is that
ngModelController uses strict equality when determining that the
parsed view value is different from the model value. Since Annotator
relies on the object identity of annotations to remain stable, it
was impractical to trigger a real view change on an annotation.

With this change, constituent values of the annotations are managed
in their own model controllers to better encapsulate the various
UI controls that make up an annotation.

In addition, some attention was put into cleaning up the templates
and clarifying the interactions with annotator events and the digest
cycle. The result is much better, I think.

Woohoo! Threading is a separate plugin now!

- Get threading service from "annotator.threading"
- setup up newly created annotations in the threading
- move draft management around a bit, to make it more automatic
  with the annotation lifecycle events
- simplify the logic of the Store monkey patch
- pass annotations to the Editor controller via showEditor
  rather than relying on on the id in the params, reducing reliance
  on temporary ids, now added by the threading plugin

Various fixes to make the bridge plugin better contained.

- parse returned results from RPC calls before sending to callbacks
- use "events" instance property to leverage Annotator's Delegator
  automatic event hookup
- manage event lifecycle sync between bridge endpoints better, such as
  establishing tags during creation to immediately synchronize new
  objects