Add a badge for Chef cookbooks

[sethvargo]

This PR adds support for Chef cookbook version badges.

@badges/owners I wasn't sure what the difference between try.html and index.html were, so I updated both. Please let me know what you need from me.

[espadrine]

Thanks a lot for this contribution!

Version information badges have traditionally been given information about the name of the corresponding package repository it is indexed in. Should I use chef, or cookbook, for that purpose? A non-thourough reading of the website makes me believe that chef is the package index' brand, while cookbook is a term used to designate a particular package, much like pypi vs. egg (now wheel) in the Python world. In which case, it would make sense to use chef both in the badge, and in the URL.

Please tell me whether you agree with that change. Otherwise, I'll do the change, and subsequently push to production on Tuesday.

I will attempt to make the use of try.html more prominent. It is currently explained on both our CONTRIBUTING.md and INSTALL.md pages, in the repo. Would explaining it in README.md be beneficial in your opinion?

[sethvargo]

Hey @espadrine! Thank you for the quick turnaround!

Cookbooks are very similar to Ruby gems. "RubyGems" is the organization that hosts them, but they are called "gems". "Chef" is the organization that hosts them, but they are called "cookbooks". Since RubyGems went with "gem", I matched that and went with "cookbook".

Since Chef is already it's own project, I think it would be confusing if the badge were chef | x.y.z. What do you think?

[sethvargo]

@espadrine I think this is what it should be:

diff --git a/server.js b/server.js
index 9e28ff7..9e1b503 100644
--- a/server.js
+++ b/server.js
@@ -824,7 +824,7 @@ cache(function(data, match, sendBadge) {
   var cookbook = match[1]; // eg, chef-sugar
   var format = match[2];
   var apiUrl = 'https://cookbooks.opscode.com/api/v1/cookbooks/' + cookbook + '/versions/latest';
-  var badgeData = getBadgeData('version', data);
+  var badgeData = getBadgeData('cookbook', data);

[espadrine]

What do you think?

I think you're the expert on this! ☺

[sethvargo]

@espadrine I blogged about this: https://sethvargo.com/chef-cookbook-badges/ 😄

[espadrine]

Cool! I retweeted it from the Shields_io account!