Added quadratic support in HashedDocDotFeatures
add LibSVMFile
add get_diagonal_vector() method to SGMatrix class
Merge pull request #1451 from votjakovr/feature/get_diagonal_vector

Add get_diagonal_vector() method to SGMatrix class
Merge pull request #1450 from gsomix/feature/libsvm

Add LibSVMFile
Merge pull request #1342 from van51/feature/quadratic

K-skip ngrams for quadratic support in HashedDoc classes
update news