Added grid search.
Added untested grid search.
Added grid_search and cross_validation test skeletons.
Added missing imports.
Merge branch 'grid_search' of https://github.com/lensacom/sparkit-learn into grid_search
Fixed typos, added missing imports.
grid_search solution proposals
Added distributed python dict_vectorizer.
Added python distributed dict_vectorizer.
Fixed missing function.
Removed unecessary intermediate function.
Refactored ArrayRDD and TupleRDD; Added DictRDD
Added slice operation to ArrayRDD
Fixed RDD tests
Fixed text feat. extraction to pass test
Added transform method to TupleRDD and DictRDD; Unified RDD API
Refactored RDD indexing: added numpy-like syntax
RDD fixes; added classification metrics; runnable grid_search implementation
Fixed grid_search and RDD issues
Renamed grid.py to grid_search.py