Add Jersey API and AngularJS

Summary

9c9fd70 Add maven back & front build integration (#65)
a925c47 Created Students Index View (#63)
ef09424 Add usersAuthorities to /users (#61)
ef7923c Backend patch number 1 (#60)
dca63d2 Add restangular for app usage (#59)
18ef123 Add various final inscription endpoints & refactored some service/dao methods (#53)
5ec1c79 remove password field from studentsShow endpoint (#58)
34c35a5 Add stateless authentication (#49)
d36e200 change servlet mapping to match API version (#55)
4449176 Add sidebar UI & a pack of services and directives (#50)
9e8325e Add Jersey for Java Server API (#48)
a0947b2 Add navbar UI & dependencies for testing angular (#47)
88ff648 Add sonarqube & coveralls integrations (#46)
dc9fddd Add angular setup (#44)
0b0f2bb Add travis-ci configuration (#43)

Notes

This is the first deployed version (to stage) with all these new tools.