AVRO-1334. Java: Update versions of many dependencies.

git-svn-id: https://svn.apache.org/repos/asf/avro/trunk@1626912 13f79535-47bb-0310-9956-ffa450edef68
AVRO-1589. Java: Fix ReflectData.AllowNulls to not create unions for primitive types.  Contributed by Ryan Blue.

git-svn-id: https://svn.apache.org/repos/asf/avro/trunk@1626913 13f79535-47bb-0310-9956-ffa450edef68