Merge pull request #97 from cavarelli/rebase_develop

Rebase develop
Header of backoffice incorporate link to voxe.org and changed root of backoffice
Better javascript code for select2
Possibility to chooose the propositions by a high level tag in the backoffice candidate
Possible to access to this functionnality with /backoffice/propositions, select the first high tag level by default
Improvement of the function
When on /propositions, it shows all the propositions and when a categorie is selected (/propositions/categorie/:name), it show the propositions of the categorie
New functionnality and slight redisgn of candidacy's profile
Modification of the candidacy's profile page and of the javascript for link testing
clean controller code
Merge pull request #96 from cavarelli/backoffice

New version of candidate backoffice