Merge #56 Get form Id for validation context thanks @harryadelb

Author: jankapunkt

lib/client/fileUpload.js

@@ -70,7 +70,7 @@ Template.afFileUpload.onCreated(function () {
   this.currentUpload = new ReactiveVar(false);
   this.inputName     = this.data.name;
   this.fileId        = new ReactiveVar(this.data.value || false);
-  this.formId        = this.data.atts.id;
+  this.formId        = AutoForm.getFormId();
   return;
 });