• Make sure setup.py of st2client package doesn't rely on functionality which is only
  available in newer versions of pip.
• Fix an issue where trigger watcher cannot get messages from queue if multiple API processes
  are spun up. Now each trigger watcher gets its own queue and therefore there are no locking
  issues. (bug-fix)
• Dev environment by default now uses gunicorn to spin API and AUTH processes. (improvement)
• Allow user to pass a boolean value for the cacert st2client constructor argument. This way
  it now mimics the behavior of the verify argument of the requests.request method.
  (improvement)