Happy 2013!

Thic changeset increments the copyright year to 2013.

Change-Id: I91c24ca0d97215284a64e0a581e7ebd76a52f8d8
Reviewed-on: http://review.couchbase.org/23990
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Reviewed-by: Volker Mische <volker.mische@gmail.com>