enforce uniqueness on e-mails
modify .env so we can test :database_authenticatable
TEMP add database_authenticatable migrations
add before filter in users controller to check for CAS
modified #new and #create methods to work with database_authenticatable
updated strong params to deal with password
added environment variable conditional to devise loading
fixed inverted conditional for strong params
added placholder for ldap e-mail lookup
add cas_auth conditionals to user form
added all Devise views
set username edit flag to true (fix failing tests)
fixed user factory to have unique emails