Added contributors
Fixed link to authorization server guide.
Test in PHP 5.5 too
Merge pull request #79 from reinink/patch-1

Fixed link to authorization server guide.
Adding auto_approve field to client details array.
Update ClientInterface.php
Merge pull request #92 from hailwood/patch-1

Adding 'auto_approve' to client details array (with updated interface docs)
Merge branch 'refs/heads/master' into develop

Conflicts:
	.travis.yml
	README.md