Resize share icons to 32x32 and remove border/background
New share icon hover mechanism
Merge branch 'master' of github.com:guardian/frontend into social-icons-32
Merge branch 'master' of github.com:guardian/frontend into social-icons-32
Merge branch 'master' of github.com:guardian/frontend into social-icons-32

Conflicts:
	article/app/views/fragments/emailSignup.scala.html
Merge pull request #3122 from guardian/social-icons-32

Social icons resize to 32px