fixed bug & clean all Class
Delete Path Entity
Add Observation GPS
Merge branch 'master' of https://github.com/FlavienKnuchel/Teaching-COMEM-MWS

Conflicts:

RESTBackEndSkeleton/src/main/java/ch/heigvd/skeleton/model/ObservationFu
el.java

RESTBackEndSkeleton/src/main/java/ch/heigvd/skeleton/model/ObservationGP
S.java

RESTBackEndSkeleton/src/main/java/ch/heigvd/skeleton/model/ObservationHe
alth.java

RESTBackEndSkeleton/src/main/java/ch/heigvd/skeleton/model/ObservationRe
fill.java
MERGE
MERGE 2