Remove old UNIX socket before trying to bind
Improved error messages at two points in the broker
Implemented MSGGT/MSGS
Implemented MSGGT/MSGS in webapp.
Better JSON format description
Updated HTTP request specs to REST
Added sender field for MSGSV messages.
Added ISAUTH command for webapp.
Implemented ISAUTH command
Added user settings storage.
Merge branch 'persistence'
Merge branch 'mesg-broker'
Merge branch 'webapp'