regterschot FE

Pull request #15: Dev

Merge in SMAL/regterschot-fe from Dev to master

* commit 'dc8103a56c9e66e2bcc74f70f1987c5697d3a27f': (38 commits)
  Backend integration
  Fixed button visibility
  Frontend buttontje to remove tab
  Update login.component.ts
  removed unused code
  login fix
  fix
  fixed bugs + changed graph button
  Update navbartop.component.html
  fixed bugs and added routerlinks
  Revert "Fixes for working dev branch"
  Fixes for working dev branch
  removed pom
  Update overview.component.ts
  fixed feedback
  merge conflict fix
  merge
  connected front-end to backend
  Update modal.component.scss
  merge fixes
  ...