[WIP] Meteor UI

Let's open this thread about the `AutoForm` migration to the upcoming **Meteor UI**.

@aldeed has already started to work on a `ui` branch. Here are some issues I have at the current state:

- [ ] The `optionnal` field parameter does not work
- [ ] `event.preventDefault` is not called on form submit
- [ ] I get a `Object #<Component> has no method 'findAll' ` error in the `formValues` function (not sure for this one)