Improved file serving; resolved error with Firefox not working with CSS

Firefox hadn't been loading the CSS previously and it was literally
driving me insane - I had the correct Content-Type and
Chrome/Safari/Opera all seemed to handle it fine.

The bug was that the Content-Type I was submitting was 'text/css'
however it turns out that for it to work in Firefox you must also
include the character set - so 'text/css; charset=utf8' it required
instead.

I've closed the appropriate issue.
Merge branch 'master' of https://github.com/programmingthomas/neon-2013

Conflicts:
	client/html/index-new.html