Squash portsigar into sigar

Change-Id: I155be0a4abb07b8acc4e6c7662954d8423e7d10a
Reviewed-on: http://review.couchbase.org/34847
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>