Improve

[toxix]

Have done some improvments

• store and remove the html5 required attribute when the dependent-field is hidden (This could the form from submitting with no proper error messages for the user)
• Change the default behavier to hide and disable (This prevents the hidden fields from beeing submitted), old behavier is still archivable
• store the disabled status before hiding and restore when show
• clean up the filter('[data-important]') and not('[data-important]') (Can't see way they are usefull? Will initialize anyway, so remove them)

sorry for putting everything together in a big pull request. If you have questions or just want to pull in parts feel free to do so.

[vollnhals]

Thanks for the improvements @toxix. I will have to look into the changes when I have time.