remove unnecessary SGObject parameter from get_parameter_gradient methods in kernel classes
Merge pull request #1504 from lambday/feature/log_determinant

fixes in log-det sampler
Merge pull request #1503 from votjakovr/develop

Remove unnecessary SGObject parameter from get_parameter_gradient methods in kernel classes
update authors and news
drop shogun.* structure and import from modshogun instead
Added method "is_sorted()" to SGVector
* plus unit tests for SGVector::qsort() and SGVector::is_sorted().
Merge pull request #1507 from tklein23/sgvector_is_sorted

Added method "is_sorted()" to SGVector
CG, COCG, CG-M solver fixed (log-det)