Log Message:
Updated from version 2.23nb1 to 2.25.

Upstream changes:

2.25 September 9 - Minor

    + Fix for set_properties() bug due to 5.10/5.8 UTF-8 differences.
    + Fix for failing tests due to localtime() issues.

2.24 September 6 - Minor

    + Added set_properties() method to set document properties.
      Added test suite and example.