Enables RSpec/ExampleWording and fixes all issues

Both avoiding 'should' and repiting 'it' on the tests description
improves reading them and also makes all descriptions consistent.

Read about cop at http://www.rubydoc.info/gems/rubocop-rspec/RuboCop/Cop/RSpec/ExampleWording

spec/lib/manager_authenticator_spec.rb

@@ -4,38 +4,38 @@ describe ManagerAuthenticator do
   let(:authenticator) { described_class.new(login: "JJB033", clave_usuario: "31415926", fecha_conexion: "20151031135905") }
 
   describe 'initialization params' do
-    it 'should cause auth to return false if blank login' do
+    it 'causes auth to return false if blank login' do
       blank_login_authenticator = described_class.new(login: "", clave_usuario: "31415926", fecha_conexion: "20151031135905")
       expect(blank_login_authenticator.auth).to be false
     end
 
-    it 'should cause auth to return false if blank user_key' do
+    it 'causes auth to return false if blank user_key' do
       blank_user_key_authenticator = described_class.new(login: "JJB033", clave_usuario: "", fecha_conexion: "20151031135905")
       expect(blank_user_key_authenticator.auth).to be false
     end
 
-    it 'should cause auth to return false if blank date' do
+    it 'causes auth to return false if blank date' do
       blank_date_authenticator = described_class.new(login: "JJB033", clave_usuario: "31415926", fecha_conexion: "")
       expect(blank_date_authenticator.auth).to be false
     end
   end
 
   describe '#auth' do
-    it 'should return false if not manager_exists' do
+    it 'returns false if not manager_exists' do
       allow(authenticator).to receive(:manager_exists?).and_return(false)
       allow(authenticator).to receive(:application_authorized?).and_return(true)
 
       expect(authenticator.auth).to be false
     end
 
-    it 'should return false if not application_authorized' do
+    it 'returns false if not application_authorized' do
       allow(authenticator).to receive(:manager_exists?).and_return(true)
       allow(authenticator).to receive(:application_authorized?).and_return(false)
 
       expect(authenticator.auth).to be false
     end
 
-    it 'should return ok if manager_exists and application_authorized' do
+    it 'returns ok if manager_exists and application_authorized' do
       allow(authenticator).to receive(:manager_exists?).and_return(true)
       allow(authenticator).to receive(:application_authorized?).and_return(true)
 
@@ -44,14 +44,14 @@ describe ManagerAuthenticator do
   end
 
   describe 'SOAP' do
-    it 'should call the verification user method' do
+    it 'calls the verification user method' do
       message = { ub: {user_key: "31415926", date: "20151031135905"} }
       allow(authenticator).to receive(:application_authorized?).and_return(true)
       expect(authenticator.send(:client)).to receive(:call).with(:get_status_user_data, message: message)
       authenticator.auth
     end
 
-    it 'should call the permissions check method' do
+    it 'calls the permissions check method' do
       allow(authenticator).to receive(:manager_exists?).and_return(true)
       expect(authenticator.send(:client)).to receive(:call).with(:get_applications_user_list, message: { ub: {user_key: "31415926"} })
       authenticator.auth