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100%

Pull #16

travis-ci

Add `font_awesome_css` helper in CdnHelper

Since the `icon` helper accepts `library: :font_awesome`, and the
Font Awesome CSS is not loaded by default by Bootstrap CSS, it is
helpful to have an additional CDN helper, so people who want to
include Font Awesome icons can simply write:

```rhtml
<%= stylesheet_link_tag font_awesome_css %>
<%= icon :heart, library: :font_awesome %>
```

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