Improve output of validate-jira-for-release script

Right now, the validate-jira-for-release outputs the data in a whitespace delimited format. Because values can have whitespace (e.g. "In Progress" or "Justin Leet"), this means that easily sorting by contributor doesn't work. This is important to contacting contributors to update Jira at release time.

Ideal output would be geared to the release manager being able to easily contact the appropriate people to update their tickets. Speaking personally, just making the output work with sort is sufficient, but it may be a better default order. Additionally, if it's possible to pull out the contributor's email (e.g. from the relevant commit), that would also make things easier.

If people want to rearrange the columns or something clever (e.g. have first column be name, so people can easily find themselves in a general list blast), that's another idea.

Finally, having a more obvious (or default) ability to just pass in version "Next + 1" might make things a bit more clear, but it's not imperative.