Added pid file usage to script/process/spawner and script/process/reaper along with a directive in default config/lighttpd.conf file to record the pid. They will all save their pid file in tmp/pids [DHH]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4294 5ecf4fe2-1ee6-0310-87b1-e25e094e27de