Need some unit test

[tvercaut]

Unit test for the diferent components would be required on the longer run. Examples of such tests for the permutohedral lattice and the CRF can be found here: https://github.com/NifTK/NiftyNet/blob/dev/tests/crf_test.py As part of the c++ code in http://graphics.stanford.edu/projects/drf/ https://github.com/lucasb-eyer/pydensecrf/tree/master/tests https://github.com/MiguelMonteiro/permutohedral_lattice/tree/master/Tests https://github.com/MiguelMonteiro/CRFasRNNLayer/tree/master/Tests