update android prototype to the new webservice api
	modified:   project.properties
	modified:   src/ch/xonix/mensa/unibe/MenuplanActivity.java
	modified:   src/ch/xonix/mensa/unibe/model/Mensa.java
	modified:   src/ch/xonix/mensa/unibe/model/NoneMenu.java
	modified:   src/ch/xonix/mensa/unibe/model/ServiceUri.java
	modified:   src/ch/xonix/mensa/unibe/request/MensasRequest.java