Atomic merge blas

blas codes can be compiled and run again (tested on ubuntu and Mac, with and without MKL). However, ex_Product.cpp, feval_blas.cpp, feval_noblas.cpp and feval_simple.cpp are not included in any makefiles and seem to include a missing header (feval_blas.h), so I could not do much about them. They seem to demonstrate pretty much the same things as the other, working codes.