Enable more debug output for bin/deploy_doc.sh

see #8387

On Tue, Nov 25, 2014 at 02:13:09PM -0800, Sudhanshu Mishra wrote:
>    In bin/deploy_doc.sh:
> 
>  >
>  >          cd gh-pages
>  >          git remote rm origin
>  > -        git remote add origin https://${GH_TOKEN}@github.com/sympy/sympy_doc.git > /dev/null 2>&1
>  > -        git fetch origin > /dev/null 2>&1
>  > +        git remote add origin https://${GH_TOKEN}@github.com/sympy/sympy_doc.git
> 
>    Oh I see that you've moved redirection to the end of file.

Yes.  Do you still think this exposes GH_TOKEN?