Actually fix authentication initializer

Resolves #1324 (and #1282 for real)
- ensures that authentication initializer actually runs
- ensures that username is copied to cas_login during migration if
  necessary

config/initializers/authentication.rb

@@ -1,7 +1,7 @@
 # Check for authentication method and copy data over if necessary (ENV variable
 # to skip if necessary, skip if migrating from a pre-v4.1.0 DB or no table)
 unless ENV['SKIP_AUTH_INIT'] || !User.table_exists? ||
-       !User.respond_to?(:username)
+       !User.column_names.include?('username')
 
   user = User.first
 

db/migrate/20150323013431_add_cas_login_to_users.rb

@@ -1,5 +1,11 @@
 class AddCasLoginToUsers < ActiveRecord::Migration
   def change
     add_column :users, :cas_login, :string
+
+    # copy username to cas_login if you use CAS already
+    if ENV['CAS_AUTH']
+      ActiveRecord::Base.connection
+        .execute('update users set cas_login=username')
+    end
   end
 end