CBD-720 Add deletion dropping mode to compactor

Change-Id: If20f7477276dddf197663886f3325e5164a9dc59
Reviewed-on: http://review.couchbase.org/23836
Reviewed-by: Damien Katz <damien@couchbase.com>
Reviewed-by: Fulu Li <fulu@couchbase.com>
Tested-by: Fulu Li <fulu@couchbase.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Volker Mische <volker.mische@gmail.com>
CBD-774: Add support for automake 1.13

Change-Id: Ibc0b3f6a745deacc2f7cc7624b10d405ad20ae99
Reviewed-on: http://review.couchbase.org/23970
Reviewed-by: Aaron Miller <apage43@ninjawhale.com>
Tested-by: Aaron Miller <apage43@ninjawhale.com>