Update topical events design inline with mockup
• move latest
• limit featured to 5
• style featured differntly according to number of items
• restyle related documents section

https://www.pivotaltracker.com/story/show/50989339
add associated meta data to header
adding meta data to heading
add conatin float to meta data
fixing failing tests
update topical events links colour to blue
update social medai icon background too
fixing failing tests and removing superfluous css
update to test description
Merge pull request #612 from alphagov/topical-events-redesign

Topical events redesign