Reactor image handling.
Now there's an object, that is initialized on the main thread, then 
it's run() method is executed on a separate thread.
Images can be displayed by calling imageHelper.show(cv::Mat), which is
thread-safe.
Merge branch 'master' into ts_findLed

Conflicts:
	include/SMEyeLDesktop.h
	src/SMEyeLDesktop.cpp