Replace schema package

[markbates]

We have been using http://www.gorillatoolkit.org/pkg/schema for the binding of HTML forms to models, however, I have run into issues using it. For example, it doesn't allow for the binding of maps to a field.

During my travels I found the following package which looks quite promising and seems to do all we need it to do:
https://github.com/monoculum/formam

This is everyone's chance to weigh in on this change.

[paganotoni]

@markbates are you working on this one ? (looking for something for my next week :) )

[markbates]

I started on it ages ago, but never finished. I'll push my branch this weekend for you.

[markbates]

@apaganobeleno i thought i had a branch, but it doesn't appear i do. sorry. i do have some code from an app that is use formam/buffalo.

hopefully that will help a bit.

	buffalo.RegisterBinder("application/x-www-form-urlencoded", func(req *http.Request, i interface{}) error {
		err := req.ParseForm()
		if err != nil {
			return errors.WithStack(err)
		}
		dec := formam.NewDecoder(&formam.DecoderOptions{TagName: "formam"})
		if err := dec.Decode(req.Form, i); err != nil {
			return errors.WithStack(err)
		}
		return nil
	})

[paganotoni]

@markbates oh yes, this is at least half of the work :), i'll keep you posted.

[paganotoni]

@markbates i think we're all set on this one, right ?