Move ep-engine to cmake

Change-Id: Idb72e2c016fecc0f71abd0e800ae815a1cc413bf
Reviewed-on: http://review.couchbase.org/30458
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>