Fire event, when rendering of form is ready

With this event, we can do some extra things to the rendered form. My use case is executing $.material.init() from https://github.com/FezVrasta/bootstrap-material-design. I can not do that with postprocess, because I need a fully rendered form in my use case.

Author: mrijken

src/directives/schema-form.js

@@ -116,7 +116,8 @@ angular.module('schemaForm')
                 }
               }
             });
-          }
+          };
+          $(element[0]).triggerHandler("sf-render-finished");
         });
       }
     };