Cleaning : remove useless libraries

[chloegugli]

We might have unused libraries that should be removed : angular-spring-data-rest, angular-toArrayFilter

[chloegugli]

It would be good to say in comments next to library import in index.html or in readme, why each library is imported. Ex: 'code mirror' for edition of object in catalog portal, 'sweet alert' for success/warning/error animated messages, 'icheck' for 'sweet alert' success, 'pace' for loading page bar...