Support for Debug Mode

[youngm]

It would be nice if there were an easy consistent way to enable debug mode for an application without adding a bunch of custom java opts.

This would be useful for tooling to simplify debugging using Diego ssh port forwarding.

Should support run and suspend modes.

[cgfrost]

I agree completely, tracker issue raised https://www.pivotaltracker.com/story/show/105552412

[nebhale]

@youngm Complete with b533b6c. If you could give it a look and let me know if it works for you, that'd be great.

[youngm]

@nebhale Looks great!