Updated project version in performance tests to 2.14-SNAPSHOT (2.13-SNAPSHOT -> 2.14-SNAPSHOT).
Added osgi-core as provided dependency to jersey-server.

Change-Id: Ia58938ec0169c967afa92aa3f50ec8e6e30502f5
Signed-off-by: Michal Gajdos <michal.gajdos@oracle.com>