Add / for showing a realestate list.
Add /:realestate & /:realestate/:id.

* /:realestate for listing properties.
* /:realestate/:id for showing a property.
Add Category - Property assoc on Category.
Add /:realestate/category/:id route.
Add views and controller for categories' property.
Add route /:realestate/search
Add search action on public controller.
Add test & function for searching by category.
Fix Vagrant file. It might be corrupted merging master.
Add tests to find by details.
Add functionality to search by details.
Add `to_a` to tests to get the `size`.
Add test to search by category & details.
Remove to_param from Category. Brought from other branch by mistake.
Implement search by ref.
Implement search by property, rename params/args & clean comments.
Add crappy form on realestate layout. (Not working yet)
Change where to find_by. Fix test.
Change where to find_by fixes test. Render instead of redirect.
Add public_controller_spec. Some pending.