Remove fuse dependency from encfs

As of
https://github.com/Homebrew/homebrew/commit/35391ad88edfa20f770cfd4ffc7ad1d9fe0d58f6

Boxen encfs prefers osxfuse rather than fuse4x. This means that people can’t
configure fuse (and thus use encfs to access credentials).

Comments welcome as to whether a puppet module to do the commands would be
useful –
https://github.com/Homebrew/homebrew/blob/22549f45b231e82960cd5f51fe2489cae5b63a11/Library/Formula/osxfuse.rb#L44-L45