* replace duff commit version of win_toast
* change expire_mins to expire_secs and add example showing use of async
* fix metadata version to keep sanity --test validate-modules happy
* code review fixes and change expire_secs to expire_seconds
* add first pass integration tests for win_toast
* win_toast no longer fails if there are no logged in users to notify (it sets a toast_sent false if this happens)
* yaml lint clean up of setup.yml in win_toast integration tests
* improve exception and stack trace if the notifier cannot be created, following feedback from dag
* removed unwanted 'echo' input parameters from return vals; added to CHANGELOG.md, removed _seconds units from module params; updated tests to match
