no follow footer links
no follow deal links
link to about page and mailto: in footer
Merge remote-tracking branch 'origin/no-follow'
update components to remove moment dependency

the most important update is an experimental version of
code42day/tweet-html that depends on yields/ago (and not on
component/moment)

also other/minor deps updates
Merge branch 'remove-moment'
Release 3.5.15