Removing deprecated SGRefObject and SGDynamicRefObjectArray (closes #1853, #1764).
Minor fix of non-existing classes in interface files (found by coincidence).
Remove generalised HMM class since its implementation is empty.
Merge pull request #2591 from iglesias/develop

Remove OpenCV/Home.md since this information is in the home of the wiki.
Merge pull request #2588 from iglesias/cleanups

Remove generalised HMM class since its implementation is empty.
Update QuadraticTimeMMD_unittest.cc

reduce accuracy in compute_variance_null to fix issue #2589
Merge pull request #2581 from tklein23/undo_sgrefobject

Removing deprecated SGRefObject and SGDynamicRefObjectArray
Class name fix in SGObject impl.