EXP-49. Adds the import descriptor necessary for bulkloading the users table.

Reviewed by: robertchu
EXP-72. Updates to use KijiJob and pack/unpackAvro.

Avro classes are no longer required on the classpath.

Reviewed by: kiyan
EXP-72. Fix pom.xml from previous change.
EXP-76. Fix extra $ in README.md.

Reviewed by: juliet