Added support for serialization to SequenceFileBolt

Added support for org.apache.hadoop.io.serializer.Serialization to the
SequenceFileBolt. The new SerializableSequenceFormat interface allows
serialization systems like Avro to be plugged into the SequenceFileBolt.
Merge branch 'master' of https://github.com/apache/storm
added STORM-595 to changelog.