AVRO-1564. Java: Fix handling of optional byte field in Thrift.  Contributed by Michael Pershyn.

git-svn-id: https://svn.apache.org/repos/asf/avro/trunk@1641892 13f79535-47bb-0310-9956-ffa450edef68
AVRO-1407: Java: Fix infinite loop on slow connect in NettyTransceiver.  Contributed by Gareth Davis.

git-svn-id: https://svn.apache.org/repos/asf/avro/trunk@1641894 13f79535-47bb-0310-9956-ffa450edef68
AVRO-1604. Java: Fix ReflectData.AllowNull to work with @Nullable annotations. Contributed by Ryan Blue.

git-svn-id: https://svn.apache.org/repos/asf/avro/trunk@1641896 13f79535-47bb-0310-9956-ffa450edef68