Added Module Session Authentication with Cookies.

Updated Demo example with the Module Session (Authentication with Cookies)
Fixed little issue with SQL query in OpenID module.

modules/session_auth/cms_session_api.e

@@ -0,0 +1,63 @@
+note
+	description: "API to manage CMS User session authentication"
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_SESSION_API
+
+
+inherit
+	CMS_MODULE_API
+
+	REFACTORING_HELPER
+
+create {CMS_SESSION_AUTH_MODULE}
+	make_with_storage
+
+feature {NONE} -- Initialization
+
+	make_with_storage (a_api: CMS_API; a_session_auth_storage: CMS_SESSION_AUTH_STORAGE_I)
+			-- Create an object with api `a_api' and storage `a_session_auth_storage'.
+		do
+			session_auth_storage := a_session_auth_storage
+			make (a_api)
+		ensure
+			session_auth_storage_set:  session_auth_storage = a_session_auth_storage
+		end
+
+feature {CMS_MODULE} -- Access: User session storage.
+
+	session_auth_storage: CMS_SESSION_AUTH_STORAGE_I
+			-- storage interface.
+
+feature -- Access
+
+	user_by_session_token (a_token: READABLE_STRING_32): detachable CMS_USER
+			-- Retrieve user by token `a_token', if any.
+		do
+			Result := session_auth_storage.user_by_session_token (a_token)
+		end
+
+	has_user_token (a_user: CMS_USER): BOOLEAN
+			-- Has the user `a_user' and associated session token?
+		do
+			Result := session_auth_storage.has_user_token (a_user)
+		end
+
+feature -- Change User session
+
+	new_user_session_auth (a_token: READABLE_STRING_GENERAL; a_user: CMS_USER;)
+			-- New user session for user `a_user' with token `a_token'.
+		do
+			session_auth_storage.new_user_session_auth (a_token, a_user)
+		end
+
+
+	update_user_session_auth (a_token: READABLE_STRING_GENERAL; a_user: CMS_USER )
+			-- Update user session for user `a_user' with token `a_token'.
+		do
+			session_auth_storage.update_user_session_auth (a_token, a_user)
+		end
+
+end