add cas support with a few tests

db/migrate/20130521210140_create_cas_user_infos.rb

@@ -0,0 +1,19 @@
+class CreateCasUserInfos < ActiveRecord::Migration
+  def change
+    create_table :cas_user_infos do |t|
+      t.integer :user_id, null: false
+      t.string :cas_user_id, null: false
+      t.string :username, null: false
+      t.string :first_name
+      t.string :last_name
+      t.string :email
+      t.string :gender
+      t.string :name
+      t.string :link
+
+      t.timestamps
+    end
+    add_index :cas_user_infos, :user_id, unique: true
+    add_index :cas_user_infos, :cas_user_id, unique: true
+  end
+end