Markdown HBS helpers

Callouts

Provides more weightage to the content

Usage

```callout-success
Callouts are cool & simple
```

Example

This post is cool

This post is informative

This post is not informative

This post is outdated

iframe

Used to embed iframe

Usage

{{iframe src="http://jsfiddle.net/selvaG/4kgwP/6/embedded/result/" height="400"}}

Example