Update filesaver.js to v2014-05-27.

[ci skip]

docs/assets/js/_vendor/filesaver.js

 /* FileSaver.js
- * A saveAs() FileSaver implementation.
- * 2014-01-24
+ *  A saveAs() FileSaver implementation.
+ *  2014-05-27
  *
- * By Eli Grey, http://eligrey.com
- * License: X11/MIT
- *   See LICENSE.md
+ *  By Eli Grey, http://eligrey.com
+ *  License: X11/MIT
+ *    See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
  */
 
 /*global self */
-/*jslint bitwise: true, regexp: true, confusion: true, es5: true, vars: true, white: true,
-  plusplus: true */
+/*jslint bitwise: true, indent: 4, laxbreak: true, laxcomma: true, smarttabs: true, plusplus: true */
 
 /*! @source http://purl.eligrey.com/github/FileSaver.js/blob/master/FileSaver.js */
 
 var saveAs = saveAs
   // IE 10+ (native saveAs)
-  || (navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))
+  || (typeof navigator !== "undefined" &&
+      navigator.msSaveOrOpenBlob && navigator.msSaveOrOpenBlob.bind(navigator))
   // Everyone else
   || (function(view) {
 	"use strict";
 	// IE <10 is explicitly unsupported
-	if (/MSIE [1-9]\./.test(navigator.userAgent)) {
+	if (typeof navigator !== "undefined" &&
+	    /MSIE [1-9]\./.test(navigator.userAgent)) {
 		return;
 	}
 	var
 		  doc = view.document
-		  // only get URL when necessary in case BlobBuilder.js hasn't overridden it yet
+		  // only get URL when necessary in case Blob.js hasn't overridden it yet
 		, get_URL = function() {
 			return view.URL || view.webkitURL || view;
 		}
-		, URL = view.URL || view.webkitURL || view
 		, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
-		, can_use_save_link =  !view.externalHost && "download" in save_link
+		, can_use_save_link = !view.externalHost && "download" in save_link
 		, click = function(node) {
 			var event = doc.createEvent("MouseEvents");
 			event.initMouseEvent(
@@ -42,7 +42,7 @@ var saveAs = saveAs
 		}
 		, webkit_req_fs = view.webkitRequestFileSystem
 		, req_fs = view.requestFileSystem || webkit_req_fs || view.mozRequestFileSystem
-		, throw_outside = function (ex) {
+		, throw_outside = function(ex) {
 			(view.setImmediate || view.setTimeout)(function() {
 				throw ex;
 			}, 0);
@@ -55,7 +55,7 @@ var saveAs = saveAs
 			while (i--) {
 				var file = deletion_queue[i];
 				if (typeof file === "string") { // file is an object URL
-					URL.revokeObjectURL(file);
+					get_URL().revokeObjectURL(file);
 				} else { // file is a File
 					file.remove();
 				}
@@ -101,8 +101,8 @@ var saveAs = saveAs
 					if (target_view) {
 						target_view.location.href = object_url;
 					} else {
-                        window.open(object_url, "_blank");
-                    }
+						window.open(object_url, "_blank");
+					}
 					filesaver.readyState = filesaver.DONE;
 					dispatch_all();
 				}
@@ -122,20 +122,9 @@ var saveAs = saveAs
 			}
 			if (can_use_save_link) {
 				object_url = get_object_url(blob);
-				// FF for Android has a nasty garbage collection mechanism
-				// that turns all objects that are not pure javascript into 'deadObject'
-				// this means `doc` and `save_link` are unusable and need to be recreated
-				// `view` is usable though:
-				doc = view.document;
-				save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a");
 				save_link.href = object_url;
 				save_link.download = name;
-				var event = doc.createEvent("MouseEvents");
-				event.initMouseEvent(
-					"click", true, false, view, 0, 0, 0, 0, 0
-					, false, false, false, false, 0, null
-				);
-				save_link.dispatchEvent(event);
+				click(save_link);
 				filesaver.readyState = filesaver.DONE;
 				dispatch_all();
 				return;
@@ -229,6 +218,10 @@ var saveAs = saveAs
 		null;
 
 	view.addEventListener("unload", process_deletion_queue, false);
+	saveAs.unload = function() {
+		process_deletion_queue();
+		view.removeEventListener("unload", process_deletion_queue, false);
+	};
 	return saveAs;
 }(
 	   typeof self !== "undefined" && self
@@ -239,4 +232,10 @@ var saveAs = saveAs
 // while `this` is nsIContentFrameMessageManager
 // with an attribute `content` that corresponds to the window
 
-if (typeof module !== "undefined") module.exports = saveAs;
+if (typeof module !== "undefined" && module !== null) {
+  module.exports = saveAs;
+} else if ((typeof define !== "undefined" && define !== null) && (define.amd != null)) {
+  define([], function() {
+    return saveAs;
+  });
+}