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
Add me to Edinburgh list.
Merge pull request #81 from latentflip/patch-1

Add me to Edinburgh list.
Split the groups list up by country (roughly)
Add a little vertical spacing between sections
Merge pull request #82 from latentflip/tidy-up-groups

Split the groups list up by country (roughly)
Add two possible venues suggested on IRC.

These venues were suggested by aaaron on IRC, who doesn't use github. I've not been to either of them myself so I'm guessing a bit at the pros/cons.
Adding tinyblob/aaaron
Please can I come along?
Merge pull request #83 from joehalliwell/patch-1

Adding joehalliwell
Update uk_edinburgh.html
Merge pull request #84 from marksutherland/patch-3

Update uk_edinburgh.html
Adds list item on consent

@tef s phrasing with invited swapped for consent and an explicit statement on dress and acting in a certain way not being consent.
Merge pull request #85 from drcable/patch-1

Adds list item on consent
Adds list item on addumptions

Needs better phrasing
Merge pull request #86 from drcable/patch-1

Adds list item on addumptions
Merge
Update us_boston.html