Release 1.6.3

Includes two minor bug fixes and documentation updates.

Bug Fixes:

- When logged in via ssh or telnet and using install_url or update_url send
  the progress output to stdout instead of /dev/console.

- Make the ONIE boot state persistent for 'install' and 'update' operations.
  Previously if the system reboots before completing the operation (power outage
  for example) the system would forget the install or update operation and try
  to boot into the OS.

Documentation:

- Updated the documentation to include a finite state machine diagram.