add printing template endpoint

[rmarianski]

• new printing app that gets wired up in settings
• new PrintTemplate model - can be managed by admin
• view that interprets the contents of the model, and returns it as html
• fixture that loads an initial template

@mpriour - can you try this out and merge into the printing branch if this is ok?

[mpriour]

Thanks for the quick turn around on this.

[rmarianski]

Whatever makes more sense. I'm not invested in having the templates in the database :)

So you're not thinking that geonode would store the templates themselves? They would just be "ghost" objects in the database that had uri's to the templates?

[mpriour]

Maybe template content makes sense for local templates. I can see the problems with ghost objects as files could be removed / renamed and totally mess things up.
However, remote URL templates could change content and you would have no notification. So maybe, have both content & url fields and if content is non null, use that, otherwise use the url

[jj0hns0n]

I think @mpriour's suggestion is good (at least for now). Lets just add a URLField to this model and one or the other (but not both) are required. We should think through that any URLs may have query string information appended to them, but I think we can worry about how to implement that later.