Fix candidacies tableView.

Now displays candidacies. One can select 2 candidates and the deckViewController will switch from the candidaciesViewController to the tagsViewController.
Add Tags model
Add Tags tableView

- Add Tags tableView
- remove request on tags tableview
- change background to white under tableViews
Display propositions
Allow the selection of multiple candidacies
Merge pull request #1 from pH-k/motion

Motion