Added ruby version to Gemfile.
Added ruby version to Gemfile.

razor-x/jekyll-and-zurb,rxfork/jekyll-and-zurb,matthiasbeyer/wiki.template,serixscorpio/serixscorpio.github.io,razor-x/jekyll-and-zurb,rxfork/jekyll-and-zurb,razor-x/jekyll-and-zurb,matthiasbeyer/wiki.template,matthiasbeyer/wiki.template