Splits ability.rb and specs into several smaller files

I'm doing this in preparation for the "Manager" ability, which will
require even more refactors of the abilities (for example,
manager can not modify their own account)

spec/models/abilities/organization_spec.rb

@@ -0,0 +1,24 @@
+require 'rails_helper'
+require 'cancan/matchers'
+
+describe "Abilities::Organization" do
+  subject(:ability) { Ability.new(user) }
+  let(:user) { organization.user }
+  let(:organization) { create(:organization) }
+  let(:debate) { create(:debate) }
+  let(:proposal) { create(:proposal) }
+
+  it { should be_able_to(:show, user) }
+  it { should be_able_to(:edit, user) }
+
+  it { should be_able_to(:index, Debate) }
+  it { should be_able_to(:show, debate) }
+  it { should_not be_able_to(:vote, debate) }
+
+  it { should be_able_to(:index, Proposal) }
+  it { should be_able_to(:show, proposal) }
+  it { should_not be_able_to(:vote, Proposal) }
+
+  it { should be_able_to(:create, Comment) }
+  it { should_not be_able_to(:vote, Comment) }
+end