Commit 27

Visits (new) :
- Layout
- Index
- Routes
- Model
- Migration

CSS :
- Fixed the z-index for overlays to be on top of all content except top
navigation menu

Rental Overview
- Bugfix, the user must be authenticated to show and press the favorite
button

RentalsController
- Added missing filters for rentals' search
- Bugfix for 4+ beds filter