Merged Diego's changes for OAuth2.0 server-side flow

src/main/java/org/scribe/builder/api/FacebookApi.java

@@ -5,8 +5,14 @@ import org.scribe.utils.*;
 
 public class FacebookApi extends DefaultApi20
 {
-  private static final String AUTHORIZE_URL = "https://graph.facebook.com/oauth/authorize?response_type=token&client_id=%s&redirect_uri=%s";
+  private static final String AUTHORIZE_URL = "https://www.facebook.com/dialog/oauth?client_id=%s&redirect_uri=%s";
 
+  @Override
+  public String getAccessTokenEndpoint()
+  {
+    return "https://graph.facebook.com/oauth/access_token";
+  }
+  
   @Override
   public String getAuthorizationUrl(OAuthConfig config)
   {