Major updates

• Targets, roles and users are now stored in the database instead of the config file
  • Your existing data will be automatically migrated into the database
  • To stave off the migration, set config_provider: file on the top level of your config file. File based target configuration will be removed in v0.7 however.

Changes

• SSH: added remote port and X11 forwarding - fixes #11, fixes #12
• SSH: record forwarded-tcpip channels
• fixed infinite HTTP redirect when the target redirects HTTP to HTTPS (#257)
• fixed #274 - don't pass-through the Host header
• fixed #269 - handle spaces in example commands
• added --debug CLI flag