Add the working-with-comments samples

Author: gjtorikian

api/ruby/working-with-comments/Gemfile

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+source "http://rubygems.org"
+
+gem "octokit",        "~> 2.0"

api/ruby/working-with-comments/Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    faraday (0.8.8)
+      multipart-post (~> 1.2.0)
+    multipart-post (1.2.0)
+    octokit (2.1.1)
+      sawyer (~> 0.3.0)
+    sawyer (0.3.0)
+      faraday (~> 0.8, < 0.10)
+      uri_template (~> 0.5.0)
+    uri_template (0.5.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  octokit (~> 2.0)

api/ruby/working-with-comments/comments_on_a_commit.rb

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+require 'octokit'
+
+# !!! DO NOT EVER USE HARD-CODED VALUES IN A REAL APP !!!
+# Instead, set and test environment variables, like below
+client = Octokit::Client.new :access_token => ENV['MY_PERSONAL_TOKEN']
+
+client.commit_comments("octocat/Spoon-Knife", "cbc28e7c8caee26febc8c013b0adfb97a4edd96e").each do |comment|
+  username = comment[:user][:login]
+  post_date = comment[:created_at]
+  content = comment[:body]
+
+  puts "#{username} made a comment on #{post_date}. It says:\n'#{content}'\n"
+end

api/ruby/working-with-comments/comments_on_an_entire_diff.rb

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+require 'octokit'
+
+# !!! DO NOT EVER USE HARD-CODED VALUES IN A REAL APP !!!
+# Instead, set and test environment variables, like below
+client = Octokit::Client.new :access_token => ENV['MY_PERSONAL_TOKEN']
+
+client.pull_request_comments("octocat/Spoon-Knife", 1176).each do |comment|
+  username = comment[:user][:login]
+  post_date = comment[:created_at]
+  content = comment[:body]
+
+  puts "#{username} made a comment on #{post_date}. It says:\n'#{content}'\n"
+end

api/ruby/working-with-comments/pull_request_comment.rb

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+require 'octokit'
+
+# !!! DO NOT EVER USE HARD-CODED VALUES IN A REAL APP !!!
+# Instead, set and test environment variables, like below
+client = Octokit::Client.new :access_token => ENV['MY_PERSONAL_TOKEN']
+
+client.issue_comments("octocat/Spoon-Knife", 1176).each do |comment|
+  username = comment[:user][:login]
+  post_date = comment[:created_at]
+  content = comment[:body]
+
+  puts "#{username} made a comment on #{post_date}. It says:\n'#{content}'\n"
+end