Move ep-engine to cmake

Change-Id: I2975aa04f9ed470f8a8a3ab80e207ae422b19a45
Reviewed-on: http://review.couchbase.org/30401
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>