Add necessary gems for backend installation
New files from backend installation
gemfile.lock exact version of gems added
Autogenerated files from registering notas resource
Autogenerated files customizing notas views
Add guard gem
Add autogenerated Guardfile
Added custom fields in correct order, removing the ones that are not used in the active admin view
Override attributes array in the index table so the columns are only the ones we need (as ActAdm design)
Def "año" method that returns year
Attributes is now defined in Backend::NotasController, (an array with only the fields needed for the index table columns) so _table view is not needed.

The forms in new and edit will be "handmaded" like the search panel.
First atempt not to forget the between dates filter.
add compatibility with aa and will paginate
removed año method
Sketched the notas _form view with the fields needed
Cosmetic
Merge branch 'backend' of github.com:BlueLemon/diputados into backend
Add area methos on notas, it gives the current area where the nota is.
description method now returns descript
commented the fields that are form nested models.