suggestion: add a Gemfile to standAlone example, +also include the sproutcore version.

[brownman]

~/RAILS/SPROUT/Lebowski/examples/hello_world/app$ sc-server
/home/dao01/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems.rb:267:in activate': can't activate rack (= 1.0.1) for [], already activated rack-1.2.2 for [] (Gem::LoadError) from /home/dao01/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:46:inblock in require'