Add new Proposal share endpoint, plus ability for ereryone to use it

app/controllers/proposals_controller.rb

@@ -45,6 +45,9 @@ class ProposalsController < ApplicationController
   def retire_form
   end
 
+  def share
+  end
+
   def vote_featured
     @proposal.register_vote(current_user, 'yes')
     set_featured_proposal_votes(@proposal)

app/models/abilities/everyone.rb

@@ -4,7 +4,7 @@ module Abilities
 
     def initialize(user)
       can [:read, :map], Debate
-      can [:read, :map, :summary], Proposal
+      can [:read, :map, :summary, :share], Proposal
       can :read, Comment
       can :read, Poll
       can :read, Poll::Question

config/routes.rb

@@ -52,6 +52,7 @@ Rails.application.routes.draw do
       put :flag
       put :unflag
       get :retire_form
+      get :share
       patch :retire
     end
     collection do