update the integration class
change to BSD
Merge pull request #2221 from kislayabhi/develop

added opencv as the optional dependency.
Relaxing function check in valgrind suppression file: libhdf5 changed function names.
Merge pull request #2227 from tklein23/develop

Relaxing function check in valgrind suppression file for libhdf5
Forgot to delete RefCount object when done.
Merge pull request #2228 from tklein23/fix_refcount_unittest_leak

Forgot to delete RefCount object (in unittest) when done
add contributions to readme
Features added for handling missing values and tree pruning
Merge pull request #2216 from yorkerlin/yorker-integration

update the integration class
Merge pull request #2226 from mazumdarparijat/C45

Add feature for tree pruning and handling missing values in C4.5
NEWS update and return type changed for prune_tree method
CART class structure added w/o implementation
Merge pull request #2230 from mazumdarparijat/C45

Minor changes in C4.5
Merge pull request #2231 from mazumdarparijat/CART

CART class structure added w/o implementation
Tiny little typo in valgrind.supp
minor fix
Merge pull request #2237 from yorkerlin/yorker-integration

minor fix for Integration.cpp
Merge pull request #2229 from pickle27/develop

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CART added