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
Merge remote-tracking branch 'jon/propositions_par_categorie' into backoffice
Modification of the candidacy's profile page and of the javascript for link testing