Add logic in the admin controller to filter the candidates by their status
Update the admin_review template to offer the possibility to filter the candidates

Fixes https://github.com/fedora-infra/nuancier/issues/45
Shorten the link displayed in the review page to avoid scrolling as much as possible

Fixes https://github.com/fedora-infra/nuancier/issues/44
Merge pull request #46 from fedora-infra/filter_cand

Filter candidates by their status