codeblock in markdown code example

Example 1: code blocks md

```
function test() {
  console.log("notice the blank line before this function?");
}
```

Example 2: markdown image

![GitHub Logo](/images/logo.png)
Format: ![Alt Text](url)

Example 3: markdown code block

```ruby
require 'redcarpet'
markdown = Redcarpet.new("Hello World!")
puts markdown.to_html
```