Bug fix release.

Changelog

• tests: honor mint mode (#618) (15 hours ago)
• fix: make ObjectStat backward compatible (#626) (3 days ago)
• fix: add method to return http headers in ObjectStat (#625) (8 days ago)
• fix: set default connection timeout to 15 minutes (#621) (8 days ago)
• tests: add more checks in list buckets functional test (#622) (10 days ago)
• tests: delay check in set bucket policy in functional test (#623) (10 days ago)
• tests: Ignore Not Implemented error for tests (#617) (11 days ago)
• api: add new method to get presigned object url for given method. (#616) (12 days ago)