Revert "Require gulp 3.9."
Revert "Require gulp 3.9."

This reverts commit 0d3439d99ba37b26c8fb51520f40c26684454cc3.

christopher-johnson/phabricator,christopher-johnson/phabricator,christopher-johnson/phabricator,christopher-johnson/phabricator,christopher-johnson/phabricator