Add Crystal documentation

assets/javascripts/views/pages/crystal.coffee

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+#= require views/pages/base
+
+class app.views.CrystalPage extends app.views.BasePage
+  prepare: ->
+    @highlightCode @findAllByTag('pre'), 'ruby'
+    return

assets/stylesheets/pages/_crystal.scss

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+._crystal {
+  @extend %simple;
+
+  blockquote {
+    @extend %note;
+  }
+}

lib/docs/filters/crystal/clean_html.rb

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+module Docs
+  class Crystal
+    class CleanHtmlFilter < Filter
+      def call
+
+        # Remove class attr from div and child nodes
+        css("div").each do |node|
+          node.xpath("//@class").remove
+        end
+
+        # Set id attributes on <h1> instead of an empty <a>
+        css("h1").each do |node|
+          node["id"] = node.at_css("a")["id"]
+        end
+
+        doc
+      end
+    end
+  end
+end

lib/docs/filters/crystal/entries.rb

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+module Docs
+  class Crystal
+    class EntriesFilter < Docs::EntriesFilter
+
+      # Set the name to h1 content
+      def get_name
+        node = at_css("h1")
+        node.content.strip
+      end
+
+      # Crystal types from url slug
+      def get_type
+        slug["blob/master/"] = ""
+        object, method = *slug.split("/")
+        object = object.capitalize
+        method ? object : "Index"
+      end
+
+    end
+  end
+end

lib/docs/scrapers/crystal.rb

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+module Docs
+  class Crystal < UrlScraper
+    self.name = "Crystal"
+    self.type = "crystal"
+    self.base_url = "https://github.com/crystal-lang/crystal-book"
+    self.initial_paths = %w(/blob/master/SUMMARY.md)
+    self.links = {
+      home: "https://crystal-lang.org/",
+      code: "https://github.com/crystal-lang/crystal"
+    }
+
+    html_filters.push "crystal/clean_html", "crystal/entries"
+
+    options[:container] = ".entry-content"
+    options[:only_patterns] = [/\/blob\/master\/.*\.md/]
+    options[:skip] = %w(/blob/master/README.md)
+
+    options[:attribution] = <<-HTML
+      <a href="http://creativecommons.org/publicdomain/zero/1.0/">CC0</a>
+    HTML
+  end
+end

public/icons/docs/crystal/SOURCE

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+https://crystal-lang.org/images/favico.ico