Start writing the CONFIGURING.md doc.

todo:

- expand on some of other .env settings
- add info to the README that points to the doc
Fix cookbook_following_spec file name typo.
Merge pull request #239 from opscode/fix_spec_typo

Fix cookbook_following_spec file name typo.
Cookbook versions have their own show page.

Its template is more or less copied directly from cookbooks/show. If we
determine that the two should remain in near-lockstep, we can extract
partials for the job.
Order cookbook versions on a monotonic attribute
Cookbooks link to each of their published versions
JS specs are passing, and running on Travis
Merge pull request #223 from opscode/show-cookbook-versions

Link to each cookbook version from the cookbook detail page
Serve paperclip uploads with nginx
Merge pull request #242 from opscode/serve-paperclip-uploads-with-nginx

Serve paperclip uploads with nginx
Restructure CONFIGURING.md and some info to README
Add back Twitter config to .env.example.

Twitter has not yet been removed from this, but will be when oc-id gets merged
in.
Merge pull request #238 from opscode/configuration_docs

Writing the CONFIGURING.md doc.
Replace Devise authentication with ChefOAuth2.

[ci skip]

This is not yet complete, as oc-id is not deployed in production and the
omniauth strategy is not open source (Travis CI builds cannot pass).

This replaces Devise (email/password) authentication with Omniauth
authentication. Supermarket uses oc-id, a Chef service, as the provider for
authentication. This means that for a user to sign up and/or sign in to
Supermarket they must create a Chef Server account, as they currently do. This
however removes the duplication of records and simplifies the communication
between the community site and Chef Server for authentication when sharing
cookbooks.

Notes:

* Remove omniauth-twitter because it is no longer being used
* Store chef_oauth2 public key on Users.
Update the chef_oauth2 extractor to be correct.
Adjust the cookbook follow spec.
Remove notnot from the signed_in? method.