added headers anchor support

Gemfile

@@ -6,5 +6,6 @@ source 'https://rubygems.org'
 group :development, :test do
   gem 'jekyll', '~> 2.5.3'
   gem 'jekyll-redirect-from', '~> 0.8.0'
-  gem 'octopress-minify-html'
+  gem 'nokogiri', '1.6.6.4'
+  gem 'octopress-minify-html', '1.3.0'
 end

Gemfile.lock

@@ -57,10 +57,13 @@ GEM
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9)
     mercenary (0.3.5)
+    mini_portile (0.6.2)
     multi_css (0.1.0)
       css_press
     multi_js (0.1.0)
       uglifier (~> 2)
+    nokogiri (1.6.6.4)
+      mini_portile (~> 0.6.0)
     octopress-hooks (2.6.1)
       jekyll (>= 2.0)
     octopress-minify-html (1.3.0)
@@ -94,7 +97,8 @@ PLATFORMS
 DEPENDENCIES
   jekyll (~> 2.5.3)
   jekyll-redirect-from (~> 0.8.0)
-  octopress-minify-html
+  nokogiri (= 1.6.6.4)
+  octopress-minify-html (= 1.3.0)
 
 BUNDLED WITH
    1.10.6

_config.yml

@@ -4,12 +4,9 @@ shared_baseurl: ""
 syntax_highlight_theme: "tomorrow-night"
 cdnurl: "//cdn.tinymce.com/4/tinymce.min.js"
 exclude:
-  - docs
   - README.md
   - Gemfile
   - Gemfile.lock
-  - build.sh
-  - v*/nav.yml
   - vendor
 
 markdown: redcarpet

_plugins/anchor.rb

@@ -1,7 +1,7 @@
 module Jekyll
   module AnchorFilter
     def anchor(input)
-      input.gsub(/[^a-zA-Z\-_]/, "").downcase if !input.nil?
+      input.gsub(/[^a-zA-Z0-9\-_]/, "").downcase if !input.nil?
     end
   end
 end

_plugins/redcarpet_custom.rb

@@ -0,0 +1,11 @@
+require 'redcarpet'
+require 'nokogiri'
+
+class Redcarpet::Render::HTML
+  def header(text, level)
+    anchor = Nokogiri::HTML(text).text.gsub(/[^a-zA-Z0-9\-_]/, "").downcase
+
+    "<a class=\"anchor\" id=\"#{anchor}\"></a>" +
+    "<h#{level}><a class=\"anchorable\" href=\"##{anchor}\">#{text}</a></h#{level}>"
+  end
+end