* 'master' of github.com:ethersphere/swarm: (54 commits)
  api, chunk, cmd, shed, storage: add support for pinning content (ethersphere#1509)
  docs/swarm-guide: cleanup (ethersphere#1620)
  travis: split jobs into different stages (ethersphere#1615)
  simulation: retry if we hit a collision on tcp/udp ports (ethersphere#1616)
  api, chunk: rename Tag.New to Tag.Create (ethersphere#1614)
  pss: instrumentation and refactor (ethersphere#1580)
  api, cmd, network: add --disable-auto-connect flag (ethersphere#1576)
  changelog: fix typo (ethersphere#1605)
  version: update to v0.4.4 unstable (ethersphere#1603)
  swarm: release v0.4.3 (ethersphere#1602)
  network/retrieve: add bzz-retrieve protocol (ethersphere#1589)
  PoC: Network simulation framework (ethersphere#1555)
  network: structured output for kademlia table (ethersphere#1586)
  client: add bzz client, update smoke tests (ethersphere#1582)
  swarm-smoke: fix check max prox hosts for pull/push sync modes (ethersphere#1578)
  cmd/swarm: allow using a network interface by name for nat purposes (ethersphere#1557)
  pss: disable TestForwardBasic (ethersphere#1544)
  api, network: count chunk deliveries per peer (ethersphere#1534)
  network/newstream: new stream! protocol base implementation (ethersphere#1500)
  swarm: fix bzz_info.port when using dynamic port allocation (ethersphere#1537)
  ...