minor change

Signed-off-by: C. Fahner <christiaanenzo@gmail.com>
add generic Service class
update UserService
extend abstract Service
add authentication methods

Signed-off-by: C. Fahner <christiaanenzo@gmail.com>
add SessionManager

Signed-off-by: C. Fahner <christiaanenzo@gmail.com>
add Context and PermissionService

Signed-off-by: C. Fahner <christiaanenzo@gmail.com>
update index.php

Signed-off-by: C. Fahner <christiaanenzo@gmail.com>