Update PDF plugin

... to cfac672e (typed-packaging branch).

Fixes #1788.

h/static/scripts/vendor/annotator.pdf.js

 // Generated by CoffeeScript 1.6.3
 /*
-** Annotator 1.2.6-dev-6623b2c
+** Annotator 1.2.6-dev-bee2b25
 ** https://github.com/okfn/annotator/
 **
 ** Copyright 2012 Aron Carroll, Rufus Pollock, and Nick Stenning.
 ** Dual licensed under the MIT and GPLv3 licenses.
 ** https://github.com/okfn/annotator/blob/master/LICENSE
 **
-** Built at: 2014-12-11 01:33:35Z
+** Built at: 2014-12-11 02:43:05Z
 */
 
 
@@ -124,9 +124,7 @@
           }
         }
       });
-      return $(this._viewer.container).on('scroll', function() {
-        return _this._onScroll();
-      });
+      return this._viewer.container.addEventListener("scroll", this._onScroll);
     };
 
     PDFTextMapper.prototype._extractionPattern = /[ ]+/g;
@@ -217,7 +215,7 @@
     };
 
     PDFTextMapper.prototype.getDocumentInfo = function() {
-      return this.app.documentInfo;
+      return this._app.documentInfo;
     };
 
     return PDFTextMapper;
@@ -314,7 +312,13 @@
       return new Promise(function(resolve, reject) {
         if (_this.annotator.domMapper.waitForInit != null) {
           return _this.annotator.domMapper.waitForInit().then(function() {
-            return resolve(_this._metadata());
+            var error;
+            try {
+              return resolve(_this._metadata());
+            } catch (_error) {
+              error = _error;
+              return reject("Internal error");
+            }
           });
         } else {
           return reject("Not a PDF dom mapper.");