• Add support for script arguments to the Windows script runner. (new feature)
  [James Sigurðarson]
• Allow user to filter executions on trigger instance id.
  [Sayli Karmarkar]
• By default the following environment variables are now available to the actions executed by
  local, remote and python runner: ST2_ACTION_API_URL, ST2_ACTION_AUTH_TOKEN. (new-feature)
• Jinja filter to make working with regex and semver possible in any place that
  support jinja (improvement)
• New experimental workflow runner based on the open-source CloudSlang project. (new-feature)
  [Eliya Sadan, Meir Wahnon, Sam Markowitz]
• Update all the code to handle all the datetime objects internally in UTC. (improvement,
  bug-fix)
• Allow users to use timediff_lt and timediff_gt rule comparison operator with many string
  date formats - previously it only worked with ISO8601 date strings. (improvement)
• Allow user to specify new secret attribute (boolean) for each action parameters. Values of
  parameters which have this attribute set to true will be masked in the log files. (new-feature)
• API server now gracefully shuts down on SIGINT (CTRL-C). (improvement)
• Fix a bug with with reinstalling a pack with no existing config - only try to move the config
  file over if it exists. (bug fix)
• Support for masking secret parameters in the API responses. Secret parameters can only be viewed
  through the API by admin users. (new-feature)
• Single sensor mode of Sensor Container uses --sensor-ref instead of --sensor-name.
• six library is now available by default in the Python sandbox to all the newly installed
  packs. (improvement)
• Dispatch an internal trigger when a datastore item has been created, updated, deleted and when
  it's value has changed. (new-feature)
• Fix a bug with st2 execution list CLI command throwing an exception on failed Mistral
  workflows. (bug-fix)
• Fix a bug with st2 execution list CLI command not displaying end_timestamp attribute for
  Mistral workflows. (bug-fix)
• Add new /v1/packs API endpoint for listing installed packs. (new-feature)
• Ability to partition sensors across sensor nodes using various partition schemes. (new-feature)
• Add ability to use action context params as action params in meta. (new-feature)
• Fix a bug in action container where rendering params was done twice. (bug-fix)
• Move /exp/actionalias/ and /exp/aliasexecution to /v1/actionalias/ and /v1/aliasexecution/
  respectively. (upgrade)
• Display friendly message for error in parameters validation on action execution. (improvement)