configure persistent history
do more generalize the AbstractBuilderCommand
select commands are now aux handlers
"exit" will now handled as "cancel" and rename "confirm" to "commit"
implement command to add a member to a group
implements powerfully update group subshell
rename command
command command class for commands which have already access to osiam
implements command to delete group
implement commands to show a or all groups
Merge branch 'master' of github.com:rainu/osiam-shell