Control: tags -1 + patch
Control: block -1 by 58658 58659
This patch adds Gocryptfs to master. It's a file-based, encrypted
overlay file system inspired by EncFS—but better.
Since there are some exotic prerequisites, I placed the code in its own file.
Please note that Gocryptfs requires updates to go-golang-org-x-net 
and go-github-com-sabhiram-go-gitignore.  Those were filed