Brand lab initial set up

Set up index.php, header.php and footer.php
Remove index.html
Include semantic-elements.php based on Barebones
Include grids.php from /examples/grids/grids.html
Set up style.css for brand lab styles
Merge branch 'master' of https://github.com/mariecurieorguk/mariecurieorguk.github.io

Conflicts:
	index.html