Coding conventions & Remification
Increase size of image captions on tablet and up
Add spacing before video elements
Use gs-baseline instead of baseline /cc @ironsidevsquincy
Merge branch 'master' of github.com:guardian/frontend into fix-video-spacing

Conflicts:
	common/app/assets/stylesheets/module/external/_witness.scss
Merge pull request #3310 from guardian/fix-video-spacing

Fix video spacing & caption text size