v0.0.6-dev

• Fixes for #54, #53, #52, #50, #41, #36, #61
• Changes to RKE config structure:
  • ip to address which now accepts both IPs/FQDN
  • advertised_address to internal_address which now defaults to address
  • advertised_hostname to hostname_override which now is optional and defaults to address
• Remove cluster from the command and change --cluster-file to --config.
• Remove upgrade command and use up for upgrade too.