Redirect port 80 to 8080 on OSX

com.meritt.oitenta.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>Label</key>
    <string>com.meritt.oitenta</string>
    <key>Program</key>
    <string>/sbin/ipfw</string>
    <key>ProgramArguments</key>
    <array>
      <string>/sbin/ipfw</string>
      <string>add 100 fwd 127.0.0.1,8080 tcp from any to me 80</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
  </dict>
</plist>