Search for lua

Change-Id: I9ff2109ed8eafa04f952982a3857b0effdf4b0c6
Reviewed-on: http://review.couchbase.org/30209
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Add snappy to deps list

Change-Id: I46727d38075726ee79ac95466ad9b7d4aa65f911