improve contact form with referer info

[Dan MacNeil]

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 affects mvhub
 importance low
 status confirmed
 tag feature
 tag refactor
 tag usability
 tag gsoc
 done

People sometimes confuse us with the agency on the page they are looking
at and use the contact form to reach out to us instead of the agency.

If we knew the page they were looking at before hitting us

inluding $ENV{'HTTP_REFERER'}; in the contact info might be useful

of course REFERER might be the contact_form URL which will be not useful.

It might be necessary to have javascript populate a hidden field to get
the page before the contact form

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