Created the Helios widget. Also added a library to communicate with the Uitzendbureau.nl API

Test Plan: Bekijk de nieuwe pagina. Test de API integratie. Test niet-bestaande recruiter ids. Test vanalles!

Reviewers: #uitzendbureau.nl, dennis

Reviewed By: #uitzendbureau.nl, dennis

Differential Revision: http://phabricator.uzbdev.nl/D326