Install krb5-auth gem
Add custom Devise authentication strategy for Kerberos
Update Devise to allow the login field to be username instead of email
Update views to not include signup option
And fix rebuilt view to use username...again
Remove password related options from Devise model
Remove custom strategy
Note package req in README
Add devise pam authenticateable gem
Note server config info
Update model to authenticate against pam
Update with ruby19 version of devise_pam_authenticatable
Merge branch 'feature-kerberos_authentication'