Refactor MultiscaleDerivativesAKAZEInvokerV2 class
Refactor MultiscaleDerivativesAKAZEInvokerV2 class

The following changes are made:

 For the class members
   - Use reference instead of pointer
   - Add const to options_

 For the range loop
 - Define "e" as the reference of evolution[i] for short-hand
 - Try to use the matrix data as soon as they are written

      i.e. Lsmooth -> Lx -> Lxx, Lxy
           Lsmooth -> Ly -> Lyy
           Multiply e.sigma_size right after the matrices are written.

h2suzuki/fast_akaze,h2suzuki/fast_akaze