add gui plugin & add command to get all instance name
change command name & return pattern
adapt "get_routing_history" cmdnot not only ip address but also hostname
bugfix:end condition of recover process in no_action
add sort func
change release logic
Merge pull request #20 from hiroaki-iwase/release

I approve and merge your request.
Merge remote-tracking branch 'remotes/master/master' into gui
refacort:error case for the release command.
Merge branch 'master' of git@github.com:roma/roma
Merge branch 'master' of https://github.com/roma/roma into gui
add new command(enabled_repetition_host_in_routingdump)
modify logic of enabled_repetition_host_in_routingdump
add new func[get_routing_event]
refactor get_routing_event
add new func[ev_enabled_repetition_host_in_routingdump] &
[ev_get_routing_event]
add [get_logs] function to plugin_gui.rb
add new logic of getting routing event
change repetition check logic
undertook log