Break resources page into individually-focused pages

* Updates links throughout the site
* Fixed all of the single/double quote mismatches in the routes file
* Added stubs asking for pull requests to the two areas (subscriptions and fitgem-on-rails) that aren't finished yet
Refactor the Backbone stack to use one-router-per-page

When the site was first created I made a single ResourcesRouter that handled routing for all of the resource types.
Over time I added more and more examples, and finally got to a point where it would be clearer if each resource
type used its own router since I just moved each resource type to its own page.

Included in this commit are also stubs for the foods router that will be used to create live data foods examples.