Add the fantastic figlet plugin

This amazing script lets you make figlets words in vim, behold:
  __ _       _      _         _               _
 / _(_) __ _| | ___| |_ ___  (_)_ __   __   _(_)_ __ ___
| |_| |/ _` | |/ _ \ __/ __| | | '_ \  \ \ / / | '_ ` _ \
|  _| | (_| | |  __/ |_\__ \ | | | | |  \ V /| | | | | | |
|_| |_|\__, |_|\___|\__|___/ |_|_| |_|   \_/ |_|_| |_| |_|
       |___/