added att_dataset for isse #1878
Merge pull request #37 from dhruv13J/KDTree

Changes CKNN pickles after adding KDTree Support; #1936
added multilabel datasets: scene and yeast
Merge pull request #38 from Jiaolong/master

added multilabel datasets: scene and yeast
Merge pull request #36 from kislayabhi/master

added att_dataset for issue #1878
Fixes Python3.3 integration test, #1936