PUBDEV-5: Add iris dataset in ARFF format.
PUBDEV-5: Add (disabled) Junit test for single valid ARFF file for Iris dataset.
Port over fix for NPE for Chunk Summary from PUB-866.
Add more test data for ARFF.
PUBDEV-5: Add initial support for ARFF, along with some test cases.
Not yet working is multi-file support.
Much more testing to come.