Fixed a bug that a PHP error occurred when no option is set.
Rephrased the email conformation message.
Corrected information in the Tips section.
Added a method that registers an action hook.
Added methods that deal with downloading files.
- Added the ability to accept URLs for the `attachments` argument for the `email` argument of the `submit` field type.
- Updated the example regarding form emails.
- Advanced the version number to help identify the changes.
- Generated the minified version to reflect the changes.