Download and use the local swiftype JS

Temp workaround due to an error in external SSL certs

• https://twitter.com/globalsign/status/786617201788723200
• https://downloads.globalsign.com/acton/fs/blocks/showLandingPage/a/2674/p/p-008f/t/page/fm/0

Status changed to merged

Mentioned in commit 54d19553