#281 Add Hook to trap browser close

[George Steimer]

We need to create javascript hooks to trap when the browser closes. If the user closes their browser while a session is active, we should:

1) ask the user if they're sure they want to continue (if they're editing a form, their changes will be lost)
2) if the user continues, fire off an asynchronous request to clean up the OC and Documentum session information and invalidate the Http Session

This isn't really a bug, but more of an enhancement request. Putting it here for greater visibility...