Ensure sessions are always closed, even if the VM receives SIGINT. #38
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This change will accomodate sessions left open due to exceptions and early termination of the VM.
It does not guarantee session closure due to native method malfunction or SIGKILL/TerminateProcess (due to Java not guaranteeing hook calls for these).
This code runs all exit hooks at the default priority and may experience minor thread sharing issues with the WebDriver object.