Add travis-ci support

This is on top of #6, since that contains some go formatting errors.
On Fri, Nov 07, 2014 at 06:52:55AM -0800, Stéphane Graber wrote:
> > @@ -0,0 +1,12 @@
> > +.PHONY: default
> > +default:
> > +	make -C lxc
> > +	make -C lxd
> > +
> > +.PHONY: check
> > +check: default
> > +	test -z "$(shell go fmt ./...)"
> 
> Same here.

It's not, that's how you tell go "build everything",

https://travis-ci.org/tych0/lxd/jobs/40297071

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> https://github.com/lxc/lxd/pull/18/files#r20013768