Include driver process liveness in some exceptions #475
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When an http request, for example, times out one might wonder if the
WebDriver process is still running.
We now use slingshot throw+ as we do for http status errors. This throw+
still includes the :driver :process but checks if it is alive and
realizes its exit value in the thrown map if dead.
Also: if an exception occurs when booting a driver, any launched WebDriver
process is now cleaned up.
Also: reworked some proc tests to always attempt cleanup even when
exceptions occur.
Closes #469