Redirect to www version and remove trailing slash

Gemfile

gem 'rack-rewrite'

rack_rewrite.rb

Kremlintunes::Application.config.middleware.insert_before(Rack::Lock, Rack::Rewrite) do
    r301 %r{^/(.*)/$}, '/$1'
    r301 /.*/,  Proc.new {|path, rack_env| "http://www.#{rack_env['SERVER_NAME']}#{path}" },     :if => Proc.new {|rack_env| ! (rack_env['SERVER_NAME'] =~ /www\./i)}
    # OR
    # r301 /.*/,  Proc.new {|path, rack_env| "http://#{rack_env['SERVER_NAME'].to_s[4..-1]}#{path}" },     :if => Proc.new {|rack_env| (rack_env['SERVER_NAME'] =~ /^www\./i)}
end