0.4 * Implement per collection search * Register secret service errors as GDBus errors * Cache default SecretService object, and provide a way to 'disconnect' it. Also 'disconnect' if service goes away. * Better use of aliases when storing passwords * Rename functions that operate on a dbus object path * Accept NULL as a SecretService parameter for many methods * Make loading items for a collection optional * More consistent use of schemas * Able to unlock and load secrets while searching for items * Cache the secret value on SecretItem * Add vala bindings and tests * Remove most varargs other than the simple password functions * Add SECRET_SCHEMA_NOTE schema * Lots of bug fixes * Documentation fixes * Testing fixes * Build fixes