Update the template used as front page of the admin section
Add form to add multiple candidates in one go
Add the template to add multiple candidates to an election
Add the controller to import multiple candidates in one go

Fixes https://github.com/fedora-infra/elections/issues/5
Add link on the admin page of an election to import multiple candidates
Specify clearly that URL are optional when uploading multiple candidates
Merge pull request #9 from fedora-infra/feature/multicandidates

Feature/multicandidates