Installed django-cas requirement
Swapped LDAP settings for CAS settings.
Added CAS url to configuration template
Removed extraneous login template
Added CAS authentication backend.
Added user creation callback
Defined user creation callback
Renamed to less conflicting module name
Updated reference to renamed callback module
Added organizational email domain for creating new user accounts
Correctly create new users from CAS, with a slight email hack.
Merge branch 'cas' into dev

Merging CAS authentication feature into development branch.
Added optional authentication backend switch to configs
Added LDAP configurations to the config file.
Added config documentation
Separated LDAP backend from entire backend array
More accurate documentation