Prawn::Icon provides a simple mechanism for rendering icons and icon fonts from
within Prawn.

The following icon fonts ship with Prawn::Icon:
- FontAwesome (http://fontawesome.io/icons/)
- Foundation Icons (http://zurb.com/playground/foundation-icon-fonts-3)
- PaymentFont (https://paymentfont.com)

WWW: https://github.com/jessedoyle/prawn-icon