initiate_wait_for_task - support :flash => true to flash while waiting #4732
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while waiting for a task, we sometimes want to show a flash indicating the UI is waiting fro the task to finish
this allows us to use something like..
and expect a flash message to be shown under the spinner
Comes from a discussion in #4628, cc @yrudman
Note this will eat any queued flash messages (which is probably ok, since any success/error messages should come from the
:action
).