Merge pull request #16 from mathieumoli/marti

ajout de Cheatsheet et son utilisation, FoundObject
Merge
Merge remote-tracking branch 'origin/master'
exam only if all labs and all lectures, random of lectures in rooms
#16 work
Correction of some bugs
Merge remote-tracking branch 'origin/master'

Conflicts:
	README.md
	src/zuul/room/LectureRoom.java
everything done but javadoc and deleting useless comments