whitespace
use minified foundation.css and jquery.js
Merge branch 'master' of https://github.com/mirage/cowabloga

Conflicts:
	lib/blog.ml
Merge branch 'master' of https://github.com/mirage/cowabloga
js: minified foundation js
whitespace
foundation: make highlight.js optional
[blog] don't hardcode /blog root: leave it to permalink
[headers] add some standard headers for HTTP response types
headers: add application/json
bootstrap: have a crack at adding bootstrap as another framework

basically seems to work though not extensively tested. also a fair amount that
could be factored out between this and `Foundation` i expect.
Put emitted pages into the XHTML namespace by default (also valid HTML)