Introduced some more dynreconf parameters

Added StereoSLAM parameters for
 - NMS Radius
 - Gridfiltering on/off
 - Gridfiltering X and Y cell count
 - Gridfiltering features per cell count
 - Best total feature maximum count

	modified:   cvt/vision/slam/stereo/StereoSLAM.cpp
	modified:   cvt/vision/slam/stereo/StereoSLAM.h
Merge pull request #36 from Crusty82/StereoSLAM

Introduced some more dynreconf parameters