loss functions added for Gradient Boosting
fixed defects found by Coverity Scan
Loss functions : minor changes and unittests
CLDA unittest added
Merge pull request #2331 from kislayabhi/unittest_old_lda

CLDA unittest added
minor changes in constructor
stochastic gradient boosting added, feature added for automagically choosing problem type in CART
Merge pull request #2316 from mazumdarparijat/gradient

loss functions added for Gradient Boosting
Merge pull request #2327 from mazumdarparijat/gd

stochastic gradient boosting added, feature added for automagically choosing problem type in CART
Merge pull request #2328 from Jiaolong/graph_cut

fixed defects found by Coverity Scan
Reverting changes in data to fix broken build on develop