Logging api

Reviewers:  @bernerdschaefer, @peterbourgon 

First pass at the internals of the logging API.  This is two layers thick.  There is a RingBuffer for log messages, and on top of this is a data structure that implements storage for and operations for each container.  (The RingBuffer probably should have been a separate submit.)

The next piece to be worked on will be the HTTP logging interface.
Really?  It's not a guard clause.


On Tue, Jul 29, 2014 at 4:26 PM, Peter Bourgon <notifications@github.com>
wrote:

> In harpoon-agent/logs.go:
>
> > +func reverse(x []string) []string {
> > +	for i := 0; i < len(x)/2; i++ {
> > +		t := x[i]
> > +		x[i] = x[len(x)-i-1]
> > +		x[len(x)-i-1] = t
> > +	}
> > +	return x
> > +}
> > +
> > +func min(x int, y int) int {
> > +	if x < y {
> > +		return x
> > +	} else {
> > +		return y
> > +	}
> > +}
>
> func min(x, y int) int {
>     if x < y {
>         return x
>     }
>     return y}
>
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> <https://github.com/soundcloud/harpoon/pull/13/files#r15525536>.
>