add some utility fonctionnality

Need to send eventually Json for all...
merge
merge
Merge branch 'master' of https://github.com/ldev6/ManETS_Server

Conflicts:
	build/classes/ca/etsmtl/gti785/ServletManETS.class
	src/ca/etsmtl/gti785/ServletManETS.java
	src/ca/etsmtl/gti785/model/PlayList.java