Add FormData shim for IE (used in bot avatar uploads).

(imported from commit 41cd090768c1299db3ca0d154ee5495802302a9f)

zephyr/static/third/html5-formdata/formdata.js

@@ -0,0 +1,37 @@
+/**
+ * Emulate FormData for some browsers
+ * MIT License
+ * (c) 2010 François de Metz
+ */
+(function(w) {
+    if (w.FormData)
+        return;
+    function FormData() {
+        this.fake = true;
+        this.boundary = "--------FormData" + Math.random();
+        this._fields = [];
+    }
+    FormData.prototype.append = function(key, value) {
+        this._fields.push([key, value]);
+    }
+    FormData.prototype.toString = function() {
+        var boundary = this.boundary;
+        var body = "";
+        this._fields.forEach(function(field) {
+            body += "--" + boundary + "\r\n";
+            // file upload
+            if (field[1].name) {
+                var file = field[1];
+                body += "Content-Disposition: form-data; name=\""+ field[0] +"\"; filename=\""+ file.name +"\"\r\n";
+                body += "Content-Type: "+ file.type +"\r\n\r\n";
+                body += file.getAsBinary() + "\r\n";
+            } else {
+                body += "Content-Disposition: form-data; name=\""+ field[0] +"\";\r\n\r\n";
+                body += field[1] + "\r\n";
+            }
+        });
+        body += "--" + boundary +"--";
+        return body;
+    }
+    w.FormData = FormData;
+})(window);