Add user api

[hadimansouri]

Add user API to manage users of each tenant in super-tenant

[mostafabarmshory]

Member is a relation between user and tenant. So we can manage this relation as resource on the server. I suggest the following API:

/saas/member/{find, new, id}
/saas/tenant/{id}/member/{find, new, id}

Member is:

id
user_id
role_id

• user_id : id of a user
• use_login: login name of a user
• role_id: id of a role
• role_name: name of a role (pluf.owner)