Description
Add Source, Target, and SourceTarget, support for AvroTrevniKeyInputFormat[1] and AvroTrevniKeyOutputFormat[2].
[1] - http://avro.apache.org/docs/1.7.4/api/java/org/apache/trevni/avro/mapreduce/AvroTrevniKeyInputFormat.html
[2] - http://avro.apache.org/docs/1.7.4/api/java/org/apache/trevni/avro/mapreduce/AvroTrevniKeyOutputFormat.html