add adding-group-members.mkd
add changing-a-group-name.mkd
add creating-a-group.mkd
add listing-group-member.mkd
add listing-groups.mkd
add buckets.mkd
add object-storages.mkd
add file-storages.mkd
Merge pull request #55 from naoki-akimoto/add_managing_groups

Add managing groups
Merge pull request #57 from naoki-akimoto/add_managing-data

Add managing data pages