add the dual KL method
Merge pull request #2356 from yorkerlin/develop

add the dual KL method
Added class CDependenceMaximization for feature selection
Merge pull request #2357 from lambday/feature/selection

Added class CDependenceMaximization for feature selection
FisherLDA.cpp preprocessor class added
FisherLDA.h preprocessor header added
added cannonical vars
FisherLDA_unittest added
fixed valgrind issues