Slicker way of quiting on less than Ruby 1.8.2

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@810 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/bin/rails

 #!/usr/local/bin/ruby
 
-puts "Rails requires Ruby 1.8.2" and exit if RUBY_VERSION < "1.8.2"
+abort "Rails requires Ruby 1.8.2" if RUBY_VERSION < "1.8.2"
 
 require File.dirname(__FILE__) + '/../lib/rails_generator'
 require 'rails_generator/scripts/generate'