Autocreate user accounts

[inghamn]

Since we use LDAP to create user accounts, we shouldn't really need to manually create each user. Instead, we should create accounts for users that are not in uReport once they've been verified via CAS.

If they are in CAS, but not in uReport, we should look up the user in LDAP and add them. We'll need to add code to do group mapping from LDAP OUs to uReport Departments.