PcntlForkingHandler Should Deal with Non-Normal Exits Better

[chrisguitarguy]

For instance, if the child process segfaults, pcntl_wifexited will return false and the handler the handle returns false eating any info about what happened.

I think this should probably throw some sort of exception in the parent process as a non-normal exit likely means that things weren't logged in the child. Can use pcntl_wtermsig.