VocabLib/include/DirectIndex.hpp
VocabLib/src/DirectIndex.cpp
VocabLib/tests/DirectIndex_test.cpp
* Moved direct index implementation to a class.

VocabLib/include/VocabTree.h
* Refactor due to change in direct index implementation.

VocabLib/tests/VocabTree_test.cpp
* Minor change, changed loop variable type.