added simplistic dictionary_auth example (#105)

demo/database_auth/sql/sample_data.sql

@@ -0,0 +1,38 @@
+-- create users table
+CREATE TABLE IF NOT EXISTS users
+(
+  id integer NOT NULL,
+  login character varying(256) NOT NULL,
+  passwd character varying(256) NOT NULL,
+  is_superuser boolean NOT NULL DEFAULT false,
+  disabled boolean NOT NULL DEFAULT false,
+  CONSTRAINT user_pkey PRIMARY KEY (id),
+  CONSTRAINT user_login_key UNIQUE (login)
+);
+
+-- and permissions for them
+CREATE TABLE IF NOT EXISTS permissions
+(
+  id integer NOT NULL,
+  user_id integer NOT NULL,
+  perm_name character varying(64) NOT NULL,
+  CONSTRAINT permission_pkey PRIMARY KEY (id),
+  CONSTRAINT user_permission_fkey FOREIGN KEY (user_id)
+      REFERENCES users (id) MATCH SIMPLE
+      ON UPDATE NO ACTION ON DELETE CASCADE
+);
+
+-- insert some data
+INSERT INTO users(id, login, passwd, is_superuser, disabled)
+VALUES (1, 'admin', '$5$rounds=535000$2kqN9fxCY6Xt5/pi$tVnh0xX87g/IsnOSuorZG608CZDFbWIWBr58ay6S4pD', TRUE, FALSE);
+INSERT INTO users(id, login, passwd, is_superuser, disabled)
+VALUES (2, 'moderator', '$5$rounds=535000$2kqN9fxCY6Xt5/pi$tVnh0xX87g/IsnOSuorZG608CZDFbWIWBr58ay6S4pD', FALSE, FALSE);
+INSERT INTO users(id, login, passwd, is_superuser, disabled)
+VALUES (3, 'user', '$5$rounds=535000$2kqN9fxCY6Xt5/pi$tVnh0xX87g/IsnOSuorZG608CZDFbWIWBr58ay6S4pD', FALSE, FALSE);
+
+INSERT INTO permissions(id, user_id, perm_name)
+VALUES (1, 2, 'protected');
+INSERT INTO permissions(id, user_id, perm_name)
+VALUES (2, 2, 'public');
+INSERT INTO permissions(id, user_id, perm_name)
+VALUES (3, 3, 'public');