Paranoia pays off
Evaluates several files simultaneously.
Tracker evaluation.

Does no longer require all cameras to have ground truth. Runs evaluation
for the video files where it is available.
Moved rapidxml to ExtLib folder
Merge remote-tracking branch 'origin/master' into 15---multiple-video-files
Merge remote-tracking branch 'origin/master' into 15---multiple-video-files
Fixed merge conflicts
Conflicts:
	conf/dense_conf.yml
	src/Analytics/CMakeLists.txt
	src/Analytics/Evaluation.hpp
	src/DenseKitchen.cpp
Speeding up MoG
Merge pull request #67 from GroupDenseKitchen/15---multiple-video-files

15   multiple video files