refacto(js) : Use angular module getters and use named functions.

https://github.com/johnpapa/angularjs-styleguide#style-y022
https://github.com/johnpapa/angularjs-styleguide#style-y024
refactor(js) : Single Responsibility principle for the app

https://github.com/johnpapa/angularjs-styleguide#style-y001
refacto(js): Use naming convention for menu controller file

https://github.com/johnpapa/angularjs-styleguide#style-y120
refacto(js): Use naming convention for main module
refacto(js): Use naming convention for beneficiaire service