Upgrade to jackson-databind 2.4.1.1

Upgrade to `jackson-databind` 2.4.1.1 due to a bug in `jackson-databind` (see FasterXML/jackson-databind#490) which potentially affects our users.

Mailing list announcement: https://groups.google.com/forum/#!topic/jackson-dev/F-y4iQnxh1Q