fix-task-form-cancel

On the task edit page you might also have noticed that Rapid didn't manage to figure out a destination for the cancel link. You can fix that by editing `tasks/edit.dryml` to be:

SHOW_PATCH

This is a good demonstration of DRYML's nested parameter feature. The `<edit-page>` makes it's form available as a parameter, and the form provides a `<cancel:>` parameter. We can drill down from the edit-page to the form and then to the cancel link to pass in a custom attribute. You can do this to any depth.

app/views/tasks/edit.dryml

@@ -0,0 +1,5 @@
+<edit-page>
+  <form:>
+    <cancel: with="&this.story"/>
+  </form:>
+</edit-page>