Common/include/DynamicMat.hpp
* Created and documented accessor methods for descriptor and image
indices.

Common/src/DynamicMat.cpp
* In copy constructor and assignment operator method, correctly
initializing class attributes.
* In clearCache method, resetting cache index, cached mat and starting
cached mat index.

HCTree/src/HCTree.cpp
* Removed preprocessor directive ruling case in which got less cluster
centers than clusters.

VocabLearn/VocabLearn.cpp
* Initializing AKMAJ nearest neighbors index parameter using generic
IndexParams.

VocabLib/include/VocabTree.h
* Initializing variable holding number of centers initialized.
* Removed preprocessor directive ruling case in which got less cluster
centers than clusters.