Add article content and css

Start by using a combination of govuk_elements and text styles from
govuk_static. Adding stylesheets for ie6, ue7 and ie8.
Add email to feedback link
Update title element

Show article title and service name in title element
Enable skip link

As well as adding a destination id a tabindex=-1 is required to get it
working in webkit (and possible other browsers)
Improved architecture of layouts and css

Created a layout for articles, partials for components and tidied up 
sass imports for readability and maintainability
Add comments to copied files

Adding url of original file
Remove focus state from main element

Main has a tabindex=-1 to make the ‘skip to main’ content link work.
We don’t want this to have a focus state.
Add l-to grid and column classes for consistency
Move copied govuk_static files to vendor folder
adding moved files
Remove superfluous comment
Remove extra line
Use content_for that avoids surprise newlines
Merge branch 'article-hardcoded'
Add cucumber as acceptance test framework.
Govspeak for view templates.

- Add govspeak gem
- Register govspeak as a handler for view templates ending in `.md`
Add site prism.
Return govspeak as an HTML quoted string.
[WIP] First feature for content designers writing articles.