Adding Salesforce as a ResourceOwner

I've implemented Salesforce as a Resource Owner. It has been tested in my Symfony2 app and it works great.

Salesforce requires your callback URL to be on ssl. This information is in their documentation, but I can make a note of it here too if you'd like

Let me know if there are any issues. I would really like this to be added to your Bundle as we use it as our primary OAuth solution. Thanks and enjoy!