update to foundation 3.2.5

Hi,
I've updated this template to use foundation 3.2.5, and thought I'd save you the work while I was at it. I also added an explicit 3.2 version stamp on the Gemfile for the zurb-foundation gem, as well as added the new version to the starting layout. I tested it on a new project and there weren't any obvious problems.
I've never done a pull request before on here, so if there are any issues, please let me know.
-Nick