Update the tests after base change.

features/steps/user.rb

@@ -9,7 +9,8 @@ class Spinach::Features::User < Spinach::FeatureSteps
   end
 
   step 'I visit unsubscribe link' do
-    visit "/unsubscribes/joh@doe.org"
+    email = Base64.urlsafe_encode64("joh@doe.org")
+    visit "/unsubscribes/#{email}"
   end
 
   step 'I should see unsubscribe text and button' do

spec/mailers/notify_spec.rb

@@ -644,7 +644,7 @@ describe Notify do
     end
 
     it 'includes unsubscribe link' do
-      unsubscribe_link = "http://localhost/unsubscribes/#{CGI.escape(user.email)}"
+      unsubscribe_link = "http://localhost/unsubscribes/#{Base64.urlsafe_encode64(user.email)}"
       should have_body_text(unsubscribe_link)
     end
   end