Syntax highlighting for asciidoc

Cool tip to track here.

http://www.methods.co.nz/asciidoc/userguide.html#_vim_syntax_highlighter

To enable syntax highlighing:

• Put a Vim autocmd in your Vim configuration file (see the example vimrc file).
• or execute the Vim command :set syntax=asciidoc.
• or add the following line to the end of you AsciiDoc source files:

  // vim: set syntax=asciidoc: