Show more info for phone number 

Display 'more info' field against phone numbers on individual contact records
Add govspeak styling to 'more info' for email

Previous commit (65cdbcbdfc161f14c0d16ca613dfb10f80beac08) added govspeak support for postal addresses and online forms but not email addresses. This makes that change for email addresses too.
Display 'more info' on individual contact records

To complement 1ed690c20af0145be1834d28ddb5c0bbd98cd821
Merge pull request #13 from bmwelby/master

More_info for phone number, and govspeak for email more_info
Display contact form descriptions.
Allow govspeak styles to override main rules.
Merge pull request #14 from alphagov/form_descriptions

Display description field for contact_form_links.