Merge branch 'sybren-cleanups-go1.8' into master

packages/flamenco-manager-go/README.md

...enco-manager-go/src/flamenco-manager/flamenco/closable.go

...s/flamenco-manager-go/src/flamenco-manager/flamenco/db.go

...nco-manager-go/src/flamenco-manager/flamenco/documents.go

...-manager-go/src/flamenco-manager/flamenco/gocheck_test.go

...nco-manager-go/src/flamenco-manager/flamenco/scheduler.go

...anager-go/src/flamenco-manager/flamenco/scheduler_test.go

...er-go/src/flamenco-manager/flamenco/task_timeout_check.go

...-manager-go/src/flamenco-manager/flamenco/task_updates.go

...ger-go/src/flamenco-manager/flamenco/task_updates_test.go

...lamenco-manager-go/src/flamenco-manager/flamenco/timer.go

...enco-manager-go/src/flamenco-manager/flamenco/upstream.go

...menco-manager-go/src/flamenco-manager/flamenco/workers.go

...-manager-go/src/flamenco-manager/flamenco/workers_test.go

packages/flamenco-manager-go/src/flamenco-manager/main.go