Remove CSS map files

We'll want to wait for the other PRs to be merged before this one to avoid merge conflicts.
That sounds better, but I defer. 



> On 26/11/2014, at 22:55, Pete Nicholls <notifications@github.com> wrote:
> 
> In .gitignore:
> 
> > @@ -3,3 +3,4 @@ Thumbs.db
> >  config.yml
> >  .sass-cache
> >  node_modules
> > +.css.map
> Does that work? Shouldn't it be *.css.map?
> 
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