Adds supports for Slim

samples/Slim/sample.slim

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+doctype html
+html
+  head
+    title Slim Examples
+    meta name="keywords" content="template language"
+    meta name="author" content=author
+    javascript:
+      alert('Slim supports embedded javascript!')
+
+  body
+    h1 Markup examples
+
+    #content
+      p This example shows you how a basic Slim file looks like.
+
+      == yield
+
+      - unless items.empty?
+        table
+          - for item in items do
+            tr
+              td.name = item.name
+              td.price = item.price
+      - else
+        p
+         | No items found.  Please add some inventory.
+           Thank you!
+
+    div id="footer"
+      = render 'footer'
+      | Copyright © #{year} #{author}