Merge pull request #127 in ASAPO/asapo from develop to master

* commit '731dfe63': (63 commits)
  change order in arguments in some functions
  get rid of default stream in C++
  change ack functions
  change signature of set_lastread_marker
  fix win
  fix tests
  renamed stuff to dataset_substream
  fix tests
  more changes, increase timeout in test
  more renames
  set default delay
  switch to ms
  rename broker -> consumer in APIs
  fix tests
  rename substream to stream
  fix tests
  replace in tests
  start renaming stream to data source
  try fix package build
  fix test
  ...