Update Gemfile to use https
Update Gemfile to use https

Resolves following warning when bundling:

  > The source :rubygems is deprecated because HTTP requests are insecure.
  > Please change your source to 'https://rubygems.org' if possible, or 'http://rubygems.org' if not. 
mojacc/web,mojacc/web,powershop/SquareSquash-web,yonglehou/web-1,powershop/SquareSquash-web,mojacc/web,SquareSquash/web,SquareSquash/web,SquareSquash/web,SquareSquash/web,yonglehou/web-1,yonglehou/web-1,mojacc/web,powershop/SquareSquash-web,powershop/SquareSquash-web,yonglehou/web-1