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

0.3
 * Add methods to get services from collections, items
 * Add methods to read and set aliases
 * Add methods which handle prompts for a DBus object path
 * Header path fix
 * Documentation fixes

0.2
 * Fix header copyright issues
 * Build fixes
 * Add missing 'authtype' attribute to the 'network' schema
 * Add secret-schemas.h to the 'stable' API

0.1
 * Initial release, not yet stable