Add KeenIO output plugin

lgtm


On Tue, Jul 15, 2014 at 4:01 PM, Jonathan Eldridge <notifications@github.com
> wrote:

> In README.md:
>
> > @@ -1,2 +1,7 @@
> >  heka-clever-plugins
> >  ===================
> > +
> > +keen-output.go
> > +--------------
> > +
> > +Sends event data to Keen.io.
>
> ebba709 <https://github.com/Clever/heka-clever-plugins/commit/ebba709>
>
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