Add path to makefile and bower as dependency

Fixes #21, and lets make run with locally installed packages.
No, you don’t need grunt, you need grunt-cli :)

On 08 Jul 2014, at 20:14, Stian Jensen <notifications@github.com> wrote:

> In README.md:
> 
> > @@ -17,10 +17,11 @@ Run `make` in the `frontend` folder and `make` in the `nin` folder.
> >  
> >  You will also need to have bower installed, and run `bower install` in the frontend folder.
> >  
> > +To use grunt, you need to install the command line utility globally, by running `sudo npm install -g grunt-cli`
> Reword to say that you "need grunt" instead?
> 
> —
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