403 from Facebook when posting - possible fix for newer Apps

[uwantfries]

I was getting a 403 when posting to Facebook to a new test App (Create app - create test of that app)
It seems the permissions returned after authorization were not populated correctly as we were asking for publish_stream scope which AFAIK seems to have been deprecated/broken

I think the line in FacebookServices should be:

Scope = "publish_actions"; // was "publish_stream"; if I use public stream then it just defaults to read-only

This fix seemed to work for me but reading the forums older apps may still support publish_stream