Move cake executables into bin directory

Refs https://github.com/cakephp/cakephp/issues/4347

Note: wasn't sure if we should just leave `Installer.php` in `src/Console`... heh, but I did.  Open to suggestions on a better location or directory name for it.
From what I saw, just boris.  But I'm not at my computer right bow.

Sent from my iPhone

> On Aug 29, 2014, at 20:48, Mark Story <notifications@github.com> wrote:
> 
> In composer.json:
> 
> > @@ -27,5 +27,8 @@
> >  	},
> >  	"scripts": {
> >  		"post-install-cmd": "App\\Console\\Installer::postInstall"
> > +	},
> > +	"config" : {
> > +		"bin-dir" : "bin"
> Does this also move the other scripts that composer normally installs like phpunit?
> 
> \
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