FeatureExtract/FeatureExtract.cpp
* Saving filtered keypoints due to border effect after describing them.

GeomVerify/GeomVerify.cpp
GeomVerify/matching.cpp
GeomVerify/matching.hpp
* Moved sortAndKeepIdx function to "matching" header.
* Implemented distance threshold to filter out candidates in the case of
binary descriptors.
* Loading keypoints without suffix.
* Refactored matchKeypoints function to receive only necessary
parameters.
* Re-named and re-factored _matchKeypointsImpl, but commented since now
OpenCV matchers are being used.
* Commented matchKeypoints function using direct index to approach
nearest descriptors search since not used.
* Commented intersectMaps function since not used.

GeomVerify/Makefile
* Removed linking against boost libraries since not necessary.

VocabBuildDB/VocabBuildDB.cpp
* Changed usage text, showing default output nn index filename.

VocabLearn/VocabLearn.cpp
* Removed unnecessary output status message showing key-value options.

VocabMatch/VocabMatch.cpp
* Changed usage text, showing default input nn index filename.