Revert "Remove the segmentation filter. It's unused."

This reverts commit 0e1d0c811d706620baf9d9decd7f6644909657cd.
commit before merge
Merge branch 'master' of https://github.com/robotics-at-maryland/tortuga

Conflicts:
	buildfiles/cmake/modules/FindOpenCV.cmake
	packages/vision/src/LineDetector.cpp
	packages/vision/test/src/TestLineDetector.cxx
Fixed a pointer issue with the sensor api
fixes for the sensor api to get the relay board working
Merge pull request #16 from nlimpariRAM/master