Add documentation around ignoring js files

https://trello.com/c/N8xHlYlK/
That sounds good.

> On Dec 4, 2014, at 7:47 AM, Damian Galarza <notifications@github.com> wrote:
> 
> In app/views/application/configuration.haml:
> 
> > @@ -87,3 +87,31 @@
> >          java_script:
> >            enabled: true
> >            config_file: config/.jshint.json
> > +
> > +  %p
> > +    If you are looking to ignore certain JavaScript files from being checked for
> > +    style issues hound supports the jshintignore file for this. There are 2
> > +    options available to you.
> > +
> > +  %p
> > +    If you already have a
> > +    %em.code .jshintignore
> > +    file Hound will automatically pick this up for you and ignore any files
> How about:
> 
> "If you already have a .jshintignore file in the root of your project, Hound will automatically pick this up for you and ignore any files listed here."
> 
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