Update layout demo page
scss-lint fix
update description of gov.uk elements
Fix typo
Improve style guide homepage
Update article content to include more components
Convert a file name to use an underscore
Set content width on article page
Fix ie6 bug

border-left in info-notice was causing the following text to be
unreadable as left indented.
Add colour variables
Fix wrapping issues
Fix sorting in .gitignore
Remove line breaks
Remove line break
Update sass, sass-rails, scss-lint. Peg sprockets
Remove Grunt, add file spec to scss-lint config