Feature request: accept launching events

[qrilka]

Currently lifecycled supports only termination events. Is there any problem with supporting instance launching events?
Of course some actions could be done on instance launch by using user_data of a launch configuration but the end result isn't the same like the case when handlers (both for instance launches and terminations) could be run on 1 dedicated host outside of a monitored ASG.

[lox]

I don't see why not! Would happily accept a PR.

[borsboom]

Without #80, I can't think of how this would make sense. Launch events happen before the instance launches, which means lifecycled wouldn't actually be running yet in order to receive the event. Together with #80 it would make perfect sense though.