include default scope to more closely emulate omniauth 0.3.0 behaviour

lib/omniauth/strategies/facebook.rb

@@ -3,6 +3,8 @@ require 'omniauth/strategies/oauth2'
 module OmniAuth
   module Strategies
     class Facebook < OmniAuth::Strategies::OAuth2
+      DEFAULT_SCOPE = 'email,offline_access'
+      
       option :client_options, {
         :site => 'https://graph.facebook.com',
         :token_url => '/oauth/access_token'
@@ -66,6 +68,7 @@ module OmniAuth
       def authorize_params
         super.tap do |params|
           params.merge!(:display => request.params['display']) if request.params['display']
+          params[:scope] ||= DEFAULT_SCOPE
         end
       end
       

spec/omniauth/strategies/facebook_spec.rb

@@ -30,8 +30,9 @@ describe OmniAuth::Strategies::Facebook do
   end
 
   describe '#authorize_params' do
-    it 'is empty by default' do
-      subject.authorize_params.should be_empty
+    it 'includes default scope for email and offline access' do
+      subject.authorize_params.should be_a(Hash)
+      subject.authorize_params[:scope].should eq('email,offline_access')
     end
   
     it 'includes display parameter from request when present' do