Add minimum width for IE 8

- Set an absolute widths for header and footer on IE6/7/8
- Increase the set width for IE to 960px so it is the same width as the
  heading. Otherwise there is a white block next to the footer when the
  browser is narrow
- Add padding to the content in the footer which makes up for the width
  of the footer element being wider. This matches the approach in the
  header
- Set the background of the inner in the heading and footer to be the
  colour of their parent elements. When IE window is narrow the parent
  elements take the window width. This was causing the content to sit on
  a blank background.
Remove incorrect comment
Remove width: 49% from GOV.UK logo

At certain viewport widths the GOV.UK logo drops below the crown logo.
Tablets and/or phones happen to exist which are the correct width to
make this bug appear.
Merge pull request #65 from dxw/feature/fix-for-certain-widths

Remove width: 49% from GOV.UK logo
Bump to 0.6.3

New in this version:

- Height and width specified on the logo
- Fix logo wrapping on some browsers (inc. Chrome on Ubuntu)
Remove specific font-size for OGL link in footer

Specifying a font-size that's different from the paragraph surrounding it
makes the link very slightly smaller, which looks strange.

Small screen font-sizes should be handled by the core typography mixins.
Merge pull request #66 from alphagov/ogl-link-slightly-smaller

Remove specific font-size for OGL link in footer
Make footer the same width as the header

In modern browsers the header and the footer were no longer the same
size. This makes them the same. Also swapped a `media-down` usage to
`media` for future proofing.
Merge pull request #59 from alphagov/ie-min-width

Add minimum width for IE 8
Bump version 0.6.4

New in this version:

- Set a width for IE <= 8 so that if the browser is small things don't get squashed
- Make header and footer widths match
- Remove strange font-size on OGL link
Add support for 'html_lang' template variable

So that we can override the default 'en' lang-code for pages that aren't English.
Add support for 'html_lang' attribute to other targets
Merge pull request #68 from alphagov/html-lang-attribute

Add support for HTML lang attribute
Version 0.7.0

Adds support for an `html_lang` context value to switch from `en` for
the document.