Facebook plug-in for Ion-Auth

Hey bvrignaud,

This is really great work. Good example of using hooks to extend Ion Auth as well.

One thing I'd recommend is changing the file_get_contents calls to use curl as many people on shared hosts wont be able to use file_get_contents.

If you want to either write a blog post/tutorial or just expand on the readme I'd be happy to link to this from the main Ion Auth readme. You'd want to cover more detailed installation instructions (including composer install with package.json example) and explain how to use the package.

- Ben Edmunds
 CI Counsel Member  |  @benedmunds
 Ion Auth  |  Securing PHP Apps