Create standard for template bindings

[fifthposition]

The binding that gets passed to the template should be the same for every template in every scenario.

• It should have as many details as possible (to allow for more template customization)
• It should have every field of the current Post instance
• It should have everything in the site's config file

(To better allow for these last two — especially seeing that the templates are only used once, for the generation of the site, and that the site's pages are static afterwards — it may make more sense to pass in the Post instance and the config, and to get at the individual fields from within the template.)

[fifthposition]

note to self: remember to try moving the processing of the Post fields into the template directly.