Add initial signal watcher to kill app (#106)
Add initial signal watcher to kill app (#106)

* Add initial signal watcher to kill app

In practice not responding to SIGINT caused end users to forcefully shut
down the underlying architecture running the application. This could
mean forcefully killing docker containers as oppoased to gracefully
handling exit requests. This submits an initial, untested,
implementation to watch for signals to quit the app.

* put a wrapper around pcntl extension for now

* better extension checking

* make sure var is defined
cspray/labrador,labrador-kennel/core