bashcomplete: split options onto separate lines

This will make it easier to add new options in the future, especially
when multiple in-progress branches add new options.

Signed-off-by: John Keeping <john@keeping.me.uk>
bashcomplete: add missing options

The --no-rebuild and --[no-]autocontinue options did not get added to
the Bash completion script when they we added to git-integration.  Add
them now.

Signed-off-by: John Keeping <john@keeping.me.uk>