Add instructions for installing on OS X

Documented from memory, as I don't have a clean system to test this on.
Merge pull request #220 from frivoal/os_x_install

Add instructions for installing on OS X
Update spec-data
typo
Update widlparser
Properly handle forced generation when a biblio isn't found.
Allow \ to escape out of biblio shortlink handling. (Other things will be escapable later.) Fixes #218.
Stop putting biblio- at the beginning of biblio link titles.
Don't generate empty biblios.
Make biblio matching case-insensitive.
WebAppSec template tweaks.
Merge pull request #225 from mikewest/webappsectweaks

WebAppSec template tweaks.