Determine required avro jars for bin artifacts

The current -bin (tgz and zip) artifacts have the following avro jars in them:

avro-1.7.4.jar
avro-ipc-1.7.7-tests.jar
avro-ipc-1.7.7.jar
avro-mapred-1.7.7-hadoop2.jar

Determine if avro-ipc-1.7.7-tests.jar, avro-ipc-1.7.7.jar, and avro-mapred-1.7.7-hadoop2.jar are needed. If not, exclude them from bin artifacts.

If any are needed, determine if a single version (1.7.4 or 1.7.7) should be used, and use that version.