Add create_account endpoint for login server

Allows the login server to create a new ScimUser who's username is encoded in the supplied expiring code

[#73324702] https://www.pivotaltracker.com/story/show/73324702
Return the email/username of the created user from the create_account endpoint

The login server needs this information for the account creation flow

[#73324702] https://www.pivotaltracker.com/story/show/73324702
[#73471338] Move test classes to test folder
https://www.pivotaltracker.com/story/show/73471338
Ldap Group Mapping
[#53029645]
https://www.pivotaltracker.com/story/show/53029645
Initial implementation of LDAP groups to scopes mapping.
Not yet complete. The groups must be persisted into the UAA db in order for them to be picked up when a token is issued.
Clean up imports