Add `name` attr to input, select, textarea fields

[icebob]

Because with it, we can generate native submittable form too. With submit button, this named fields can be send to server side with POST. Spec

• add name attributes from schema.inputName property to input, select, textarea fields
• create example. POST data to https://httpbin.org/post
• cover with tests
• update docs

[icebob]

Development in form_name_attr branch

[lionel-bijaoui]

It seems a bit too much work for 0.5.0, why not for another milestone (0.6.0) ? I really need to use this version in the coming weeks.

[icebob]

Merged with #86

[icebob]

Released