Add new attributes to return for users and repos

This commit:
- Adds `hireable` to the whitelisted attributes available on the `owner` hash.
- Adds decorator methods for `stargazers_count` and `forks_count` to the `Repository` object.

Why?
- This will allow users of this gem to access more useful information from users and repositories.

Author: kenyonj

lib/jekyll-github-metadata/repository.rb

@@ -105,6 +105,7 @@ def repo_pages_info_opts
         :public_gists,
         :followers,
         :following,
+        :hireable,
         :created_at,
         :updated_at,
       ])
@@ -237,6 +238,14 @@ def url_without_path
         uri.dup.tap { |u| u.path = "" }.to_s
       end
 
+      def stargazers_count
+        repo_pages_info["stargazers_count"] || 0
+      end
+
+      def forks_count
+        repo_pages_info["forks_count"] || 0
+      end
+
       private
 
       def memoize_value(var_name, value)

spec/repository_spec.rb

@@ -39,6 +39,14 @@
     it "respects the source branch" do
       expect(repo.git_ref).to eql("master")
     end
+
+    it "returns the stargazers_count" do
+      expect(repo.stargazers_count).to eq(22)
+    end
+
+    it "returns the fork count" do
+      expect(repo.forks_count).to eq(4)
+    end
   end
 
   context "hubot.github.com" do