#10 Support LDAP for user authentication & contacts

[Anonymous]

It would be great if one of two options were possible:
- user names are entered and their accounts can be set
to authenticate and pull contact info from LDAP, or
- the admin interface can search an LDAP server for
user accounts and they can be added to companies,
groups, whatever. Any account not specifically assigned
would be assigned to a default company with no special
permissions (only able to see "ALL" shared projects).