Changed all script/* to use /usr/bin/env ruby instead of hard-coded Ruby path. public/dispatcher.* still uses the hard-coded path  for compatibility with web servers that dont have Ruby in path [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2959 5ecf4fe2-1ee6-0310-87b1-e25e094e27de