Add Chef documentation

Chef documentation from docs.chef.io
Should work so far. Haven't figured out with which command you generate
the iconset though. Added the logo from the official logo download
site (as stated in "SOURCE"). Also pinged a marketing person at chef
which didnt respond yet.

assets/stylesheets/application-dark.css.scss

@@ -33,6 +33,7 @@
         'pages/apache',
         'pages/bower',
         'pages/c',
+        'pages/chef',
         'pages/chai',
         'pages/clojure',
         'pages/coffeescript',

assets/stylesheets/application.css.scss

@@ -34,6 +34,7 @@
         'pages/bower',
         'pages/c',
         'pages/chai',
+        'pages/chef',
         'pages/clojure',
         'pages/coffeescript',
         'pages/d3',

assets/stylesheets/pages/_chef.scss

@@ -0,0 +1,4 @@
+._chef {
+  @extend %simple;
+
+}

lib/docs/filters/chef/clean_html.rb

@@ -0,0 +1,10 @@
+module Docs
+  class Chef
+    class CleanHtmlFilter < Filter
+      def call
+        css('h1 a', 'h2 a', 'h3 a','div.footer').remove
+        doc
+      end
+    end
+  end
+end

lib/docs/filters/chef/entries.rb

@@ -0,0 +1,10 @@
+module Docs
+  class Chef
+    class EntriesFilter < Docs::EntriesFilter
+      def get_name
+        at_css('div.body h1 a').remove
+        at_css('div.body h1').content
+      end
+    end
+  end
+end

lib/docs/scrapers/chef.rb

@@ -0,0 +1,27 @@
+module Docs
+  class Chef < UrlScraper
+    self.name = 'Chef'
+    self.slug = 'chef'
+    self.type = 'chef'
+    self.version = '12.5'
+    self.base_url = 'https://docs.chef.io/'
+    self.links = {
+      home: 'https://www.chef.io/',
+      docs: 'https://docs.chef.io/'
+    }
+
+    html_filters.push 'chef/entries', 'chef/clean_html'
+
+    options[:container] = '.bodywrapper'
+
+    options[:only_patterns] = [/resource_.*.html/]
+    options[:skip_patterns] = [/resource_common\.html/]
+
+    options[:trailing_slash] = false
+
+    options[:attribution] = <<-HTML
+      &copy; 2015 Chef Software, Inc.<br>
+      Creative Commons Attribution 3.0 Unported License.
+    HTML
+  end
+end

public/icons/docs/chef/SOURCE

@@ -0,0 +1 @@
+http://style.chef.io/assets/images/downloads/Chef_Regular.png