Properly handle titles with trailing punctuation

lib/jekyll/document.rb

@@ -53,7 +53,7 @@ module Jekyll
     # sequence of spaces and non-alphanumeric characters replaced with a
     # hyphen.
     def slug(name)
-      name.downcase.gsub(/[\W\s]+/, '-')
+      name.downcase.gsub(/[^\w]/, " ").strip.gsub(/\s+/, '-')
     end
 
     # The extension name of the document.

test/source/_slides/example-slide-4.html

@@ -0,0 +1,15 @@
+---
+  title: So what is Jekyll, exactly?
+  layout: slide
+---
+
+Jekyll is a simple, blog-aware, static site generator. It takes a template
+directory containing raw text files in various formats, runs it through
+[Markdown](http://daringfireball.net/projects/markdown/) (or
+[Textile](http://redcloth.org/textile)) and
+[Liquid](http://wiki.shopify.com/Liquid)
+converters, and spits out a complete, ready-to-publish static website suitable
+for serving with your favorite web server. Jekyll also happens to be the engine
+behind [GitHub Pages](http://pages.github.com), which means you can use Jekyll
+to host your project’s page, blog, or website from GitHub’s servers **for
+free**.

test/test_document.rb

@@ -213,18 +213,18 @@ class TestDocument < Test::Unit::TestCase
         "collections" => {
           "slides" => {
             "output"    => true,
-            "permalink" => "/slides/test/:title"
+            "permalink" => "/slides/:title"
           }
         },
         "source"      => source_dir,
         "destination" => dest_dir
       }))
       @site.process
-      @document = @site.collections["slides"].docs[0]
+      @document = @site.collections["slides"].docs[3]
     end
 
     should "produce the right URL" do
-      assert_equal "/slides/test/example-slide", @document.url
+      assert_equal "/slides/so-what-is-jekyll-exactly", @document.url
     end
   end