Fix Let's Encrypt issue

[junderw]

Using github.com/golang/crypto at their most recent version includes http support for the LE challenge.

golang/crypto@13931e2

13 days ago they added this as a workaround to the issues where LE has removed the other challenge methods due to a vuln.

For now HTTP is the only method available to go's acmecert package.

Some of the glide dependencies in glide.lock got borked when I ran glide update... so I will leave the branch open to edits from maintainers.

This branch currently builds for us and works fine.

Thanks.

[dabura667]

@Roasbeef ping. The official faucet is grandfathered in to the old way of performing Let's Encrypt.

The current repository will not work for any new domains. This pull request does work for all new domains.

[dabura667]

@halseth @Roasbeef this is still broken.

Starting up a new faucet with a new domain is broken... the only reason your faucet still works is because you were grandfathered into Let’s Encrypt’s verification method you are using.

If you let your LE lapse even once, your site will no longer work until you merge this.

[Roasbeef]

Oops, realized I didn't have notifications turned on for this repo!

[Roasbeef]

LGTM 🍺