openid_provider 6.x-1.0-rc1

I think we are ready for a release candidate. This module now works on all RP I can try and I have cleaned up the code significantly.

There are still some bits that are not complete in our implementation, most notably #506530: Private association support, #334876: Associate requests using 1.x or compatibility mode fail, #1158436: perform security audit and #1419020: Cannot login to Slashdot.

We have also some patches waiting in the queue, but since I have done so much work to improve the compatibility of this module over the years, I think it's now ready to mature to a 1.0 state.

Please, test the heck out of this.