Upgrade foundation-zurb-template to 27cfc846b329

Summary:
As the current version doesn't build well with npm,
updates the template keeping the src/ content as is.

Template changelog:
https://github.com/zurb/foundation-zurb-template/compare/91b8c2ab9ab0...27cfc846b329

Test Plan: npm build

Reviewers: dereckson

Reviewed By: dereckson

Differential Revision: https://devcentral.nasqueron.org/D1326