Adding types to variables that would have their types inferred from
function return types causes lint errors in go1.10.3 (my local machine).

Change-Id: I71ffbe7843084b4bd22b15ed223ed05d4ccc9aaa

The `blubber` command already gets everything it needs from explicit
inputs, which makes it an easy candidate for running as a simple
microservice. This patch provides exactly that in the form of
`blubberoid`, an HTTP server that processes Blubber configuration.

To start the daemon:

    make && blubberoid

To use it:

    curl -i -X POST --data-binary @blubber.example.yaml http://:8748/[variant]

Change-Id: Ieea73048d092b974da424ba40ddc90eaf693af0b