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To solve #41

add feature importances (#42)

update for typo.

# Conflicts:
#	src/io/dataset.cpp
#	src/io/ordered_sparse_bin.hpp
#	src/treelearner/leaf_splits.hpp
#	src/treelearner/serial_tree_learner.cpp

merge to master.

support max_depth option, to solve (#33)

* a python regression example

* add early-stopping

* fix bugs

* remove not needed files

* update easy-stopping; fix warnings; add alias

* add comments; remove useless line

* change code order

* change Print to PrintAndGetLoss: return loss

* change comment; add bracket

* change return type of PredictLeafIndex in boosting.h

* move string cast into lambda function

* move if-then outside predict_fun

add lru pool to reduce memory usage when #feature is large(#4)

Conflicts:
	include/LightGBM/config.h
	src/metric/binary_metric.hpp