Merge branch 'master' into feat/iota.go

plugins/autopeering/saltmanager/saltmanager.go

plugins/autopeering/server/tcp/server.go

plugins/autopeering/server/udp/server.go

plugins/bundleprocessor/bundleprocessor.go

plugins/bundleprocessor/bundleprocessor_test.go

plugins/bundleprocessor/events.go

plugins/bundleprocessor/plugin.go

plugins/gossip/neighbors.go

plugins/gossip/send_queue.go

plugins/gossip/server.go

plugins/gracefulshutdown/plugin.go

plugins/statusscreen-tps/plugin.go

plugins/statusscreen/statusscreen.go

plugins/tangle/plugin.go

plugins/tangle/solidifier.go

plugins/webapi/plugin.go

plugins/zeromq/plugin.go