Add ability to show recent issues and then 'unfurl' the full panel for one of those issues

[russmiles]

Noticed that I needed to see an issue where the panel for that issue was waaay back some days ago. I knew the issue number, and I simply wanted to use Atomist to add a comment but found myself having to scroll back quite a way to do this. 

I wondered if there was a way of asking Atomist to display the last three issues right now so I could then ask the one I need (if it's there) to unfurl with its panel of buttons... 

I think to do this we would need to:

• add functionality similar to ”list issues" and "open issues" where you can show issues and add buttons to unfurl/open the panel for an issue.
• might need to extend GH http functions to accept the type of filter needed