Started DataSplitter.
Added first SplitStep implementation
Added getNextPartition to DataStore
merged to update DataStore
Moved SplitStep to splitstep package. Abstracted PredicateSplitStep and
created uniform splitter.
Made PredicateSplitStep able to split on only atoms, fixed bug in
uniform splitting
Fixed bug where PredicateSplitStep didn't return anything
Removed round robin split step and abstract layering; random is almost
always preferred. Added query random split step
Added Query Uniform split step
added new classes for multiclass prediction stats
Merge remote-tracking branch 'origin/refactor' into refactor