Add example site for testing

example/_posts/2012-03-15-layout-sidebar-custom.md

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+---
+title: "Layout: Sidebar Custom"
+excerpt: "A post to custom sidebar content."
+author_profile: false
+sidebar:
+  - title: "Title"
+    image: http://placehold.it/350x250
+    image_alt: "image"
+    text: "Some text here."
+  - title: "Another Title"
+    text: "More text here."
+---
+
+This post has a custom sidebar set in the post's YAML Front Matter..
+
+An example of how that YAML could look is:
+
+```yaml
+sidebar:
+  - title: "Title"
+    image: http://placehold.it/350x250
+    image_alt: "image"
+    text: "Some text here."
+  - title: "Another Title"
+    text: "More text here."
+```