seg2fragments minor update
Updated naz_segment_image

This script uses already trained classifier and performs segmentation on
any spefified image from dataset.

TOFIX: wierd behavior when trying to re-use merging boundary information.
'boundaryInfo' structure that is passed to merging function for unknown
reasons is different when loaded from .mat, Must re-extract features on every stage to make
it work properly without errors.

Also, for unkown reason re-extracted features are different (size of .mat
files are different) than in classifier directory ('boundary_features' directory).