Added a vector that contains objects that left the image.

This vector should be investigated if objects are lost in a entry area.
Did a simple flow counter which counts people who enters and people that leavs

Is using global variables which is not camera specific, for example
yMax yMin and peopleEntered.
m

Minor changes
Config init
Merge remote-tracking branch 'origin/master' into ConfigGUI
Updated so camera has own counting variablesu

Updated so camera has own counting variables
Merge branch 'master' into counting_exiting_objects

Conflicts:
	conf/dense_conf.yml
	src/DenseKitchen.hpp
Merging entity system
Paranoia pays off
Updated stuff
Created new algorithm for flowestimation. Not added in any way to DenseKitchen cpp etc...
Merge remote-tracking branch 'origin/master' into GUIssues
Created flow estimator for one camera

Some important changes in denseKitchen files
Estimation of flow for all cameras!
minor cosmetic change
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
Added mask drawing functionality