doc: update release notes for new sample apps
doc: update release notes for new sample apps

 Updated release notes release description notes:
 - added new sample applications to list: Link Bonding,Skeleton, Callbacks, Jobstats
 - updated copyright date to 2015

Signed-off-by: Siobhan Butler <8cf2da75f16c15b95e66f52a35c85d9ba5dc91d6@intel.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk