Fixing bugs with white on black version

Fixes bugs:

-You couldn't change back to black on white version once in white
on black.

-Link is now in the colours you'll get if you click it.
text size and acessibility improvements

Increased text size as reccomended and put the #content width in
EMs so it will scale on firefox.
Increased line height on menu so readable on /really/ small screens
(feature phones. What's "computer" in afrikaans?
Fixing spelling in index
Spelling in style.css
Some tinkering with the rules

This started out just wanting to make it clear that the code of
conduct applied online. This resulted in some editing of the openin
paragraph, which resulted in some editing of where in the list things
went, which resulted in me splitting and elaborating on some of the
items.

I think I've largely preserved the original intent. Please tell me if
you think I've screwed up something important.
are not -> aren't
more tinkering with the feminism line
adding myself, I want to be one of the cool kidz too

<3
Merge pull request #74 from DRMacIver/rules_tinkering

Some tinkering with the rules
Update uk_edinburgh.html
Merge pull request #75 from marksutherland/patch-1

more attendees
Put time in
Code of conduct reminder on london page
Add href target for code of conduct
I am bad at html
FYUL closes quite early

FYUL closes at 8pm, which wouldn't leave that much time for a post-work meet.
Update uk_edinburgh.html

Added the hoose as a usual suspect.
Merge pull request #77 from marksutherland/patch-2

Update uk_edinburgh.html
Create uk_oxford.html
Merge pull request #78 from omgmog/gh-pages

Create uk_oxford.html