FileSaver.js: Add fresh FileSaver.js code, for saveAs function.

From https://github.com/eligrey/FileSaver.js, commit
975159128137bc3ccfbe66706f439a18761aa0ee.

Author: dpgeorge

Diff for: FileSaver.js

@@ -0,0 +1,188 @@
+/* FileSaver.js
+ * A saveAs() FileSaver implementation.
+ * 1.3.2
+ * 2016-06-16 18:25:19
+ *
+ * By Eli Grey, http://eligrey.com
+ * License: MIT
+ *   See https://github.com/eligrey/FileSaver.js/blob/master/LICENSE.md
+ */
+
+/*global self */
+/*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 || (function(view) {
+	"use strict";
+	// IE <10 is explicitly unsupported
+	if (typeof view === "undefined" || typeof navigator !== "undefined" && /MSIE [1-9]\./.test(navigator.userAgent)) {
+		return;
+	}
+	var
+		  doc = view.document
+		  // only get URL when necessary in case Blob.js hasn't overridden it yet
+		, get_URL = function() {
+			return view.URL || view.webkitURL || view;
+		}
+		, save_link = doc.createElementNS("http://www.w3.org/1999/xhtml", "a")
+		, can_use_save_link = "download" in save_link
+		, click = function(node) {
+			var event = new MouseEvent("click");
+			node.dispatchEvent(event);
+		}
+		, is_safari = /constructor/i.test(view.HTMLElement)
+		, is_chrome_ios =/CriOS\/[\d]+/.test(navigator.userAgent)
+		, throw_outside = function(ex) {
+			(view.setImmediate || view.setTimeout)(function() {
+				throw ex;
+			}, 0);
+		}
+		, force_saveable_type = "application/octet-stream"
+		// the Blob API is fundamentally broken as there is no "downloadfinished" event to subscribe to
+		, arbitrary_revoke_timeout = 1000 * 40 // in ms
+		, revoke = function(file) {
+			var revoker = function() {
+				if (typeof file === "string") { // file is an object URL
+					get_URL().revokeObjectURL(file);
+				} else { // file is a File
+					file.remove();
+				}
+			};
+			setTimeout(revoker, arbitrary_revoke_timeout);
+		}
+		, dispatch = function(filesaver, event_types, event) {
+			event_types = [].concat(event_types);
+			var i = event_types.length;
+			while (i--) {
+				var listener = filesaver["on" + event_types[i]];
+				if (typeof listener === "function") {
+					try {
+						listener.call(filesaver, event || filesaver);
+					} catch (ex) {
+						throw_outside(ex);
+					}
+				}
+			}
+		}
+		, auto_bom = function(blob) {
+			// prepend BOM for UTF-8 XML and text/* types (including HTML)
+			// note: your browser will automatically convert UTF-16 U+FEFF to EF BB BF
+			if (/^\s*(?:text\/\S*|application\/xml|\S*\/\S*\+xml)\s*;.*charset\s*=\s*utf-8/i.test(blob.type)) {
+				return new Blob([String.fromCharCode(0xFEFF), blob], {type: blob.type});
+			}
+			return blob;
+		}
+		, FileSaver = function(blob, name, no_auto_bom) {
+			if (!no_auto_bom) {
+				blob = auto_bom(blob);
+			}
+			// First try a.download, then web filesystem, then object URLs
+			var
+				  filesaver = this
+				, type = blob.type
+				, force = type === force_saveable_type
+				, object_url
+				, dispatch_all = function() {
+					dispatch(filesaver, "writestart progress write writeend".split(" "));
+				}
+				// on any filesys errors revert to saving with object URLs
+				, fs_error = function() {
+					if ((is_chrome_ios || (force && is_safari)) && view.FileReader) {
+						// Safari doesn't allow downloading of blob urls
+						var reader = new FileReader();
+						reader.onloadend = function() {
+							var url = is_chrome_ios ? reader.result : reader.result.replace(/^data:[^;]*;/, 'data:attachment/file;');
+							var popup = view.open(url, '_blank');
+							if(!popup) view.location.href = url;
+							url=undefined; // release reference before dispatching
+							filesaver.readyState = filesaver.DONE;
+							dispatch_all();
+						};
+						reader.readAsDataURL(blob);
+						filesaver.readyState = filesaver.INIT;
+						return;
+					}
+					// don't create more object URLs than needed
+					if (!object_url) {
+						object_url = get_URL().createObjectURL(blob);
+					}
+					if (force) {
+						view.location.href = object_url;
+					} else {
+						var opened = view.open(object_url, "_blank");
+						if (!opened) {
+							// Apple does not allow window.open, see https://developer.apple.com/library/safari/documentation/Tools/Conceptual/SafariExtensionGuide/WorkingwithWindowsandTabs/WorkingwithWindowsandTabs.html
+							view.location.href = object_url;
+						}
+					}
+					filesaver.readyState = filesaver.DONE;
+					dispatch_all();
+					revoke(object_url);
+				}
+			;
+			filesaver.readyState = filesaver.INIT;
+
+			if (can_use_save_link) {
+				object_url = get_URL().createObjectURL(blob);
+				setTimeout(function() {
+					save_link.href = object_url;
+					save_link.download = name;
+					click(save_link);
+					dispatch_all();
+					revoke(object_url);
+					filesaver.readyState = filesaver.DONE;
+				});
+				return;
+			}
+
+			fs_error();
+		}
+		, FS_proto = FileSaver.prototype
+		, saveAs = function(blob, name, no_auto_bom) {
+			return new FileSaver(blob, name || blob.name || "download", no_auto_bom);
+		}
+	;
+	// IE 10+ (native saveAs)
+	if (typeof navigator !== "undefined" && navigator.msSaveOrOpenBlob) {
+		return function(blob, name, no_auto_bom) {
+			name = name || blob.name || "download";
+
+			if (!no_auto_bom) {
+				blob = auto_bom(blob);
+			}
+			return navigator.msSaveOrOpenBlob(blob, name);
+		};
+	}
+
+	FS_proto.abort = function(){};
+	FS_proto.readyState = FS_proto.INIT = 0;
+	FS_proto.WRITING = 1;
+	FS_proto.DONE = 2;
+
+	FS_proto.error =
+	FS_proto.onwritestart =
+	FS_proto.onprogress =
+	FS_proto.onwrite =
+	FS_proto.onabort =
+	FS_proto.onerror =
+	FS_proto.onwriteend =
+		null;
+
+	return saveAs;
+}(
+	   typeof self !== "undefined" && self
+	|| typeof window !== "undefined" && window
+	|| this.content
+));
+// `self` is undefined in Firefox for Android content script context
+// while `this` is nsIContentFrameMessageManager
+// with an attribute `content` that corresponds to the window
+
+if (typeof module !== "undefined" && module.exports) {
+  module.exports.saveAs = saveAs;
+} else if ((typeof define !== "undefined" && define !== null) && (define.amd !== null)) {
+  define([], function() {
+    return saveAs;
+  });
+}