Force.com API in Scribe-Java

Hi Pablo,

Here is an API implementation for the Force.com OAuth handshake.  You'll notice that I extended the Token class because Force.com returns extra information in its token that needs to be extracted and provided to the developer.  In order to not clutter up your code, I included everything in the same file.

Also, you'll probably notice that a salesforce.com copyright is included in the header.  This is the result of a month long fight with lawyers (argh....).  I'm hoping it's acceptable to you because it's only included in the one API file and not in any of your core infrastructure.  If not, I completely understand.  Please let me know if you have a problem with the copyright stuff because that would be good feedback.

Thanks.
-Tim