first test get sensors working as intended

Conflicts:
	AMT_Project/AMT_Project/src/main/java/ch/heigvd/amt_project/model/Fact.java
	AMT_Project/AMT_Project/src/main/java/ch/heigvd/amt_project/model/Observation.java
	AMT_Project/AMT_Project/src/main/java/ch/heigvd/amt_project/model/Organization.java
	AMT_Project/AMT_Project/src/main/java/ch/heigvd/amt_project/model/User.java