Add fields to site for contact details

[SineDave]

Jeremy - thank you for developing this awesome tool, my team and I love it.

One thing that would be absolutely amazing for us to have added to Netbox would be the ability to store a site contact name, phone and email under each site. That is really useful when we don't have actual technical folks at all locations.

Here's a terrible mockup of how i'd love Sites to look:

[jeremystretch]

This probably ties in with #173 but I'll have to give some more thought to how we can best model the relationship between a site and its owner.

[mikebrandl]

This really would be nice, just to add a +1

[Armadill0]

A most welcome feature for me, too! 😃