Agile Support

While I'm not a by-the-book agile follower, there are a number of nice concepts that have come out of this methodology. I won't spend time discussing agile development in depth, but I would like nimble to have native support for:

• Story points
• Epics. These can have story points, but assume the aggregate number of points associated with their stories. Epics are Github issues that are associated with stories (also Github issues).
• Stories. These are Github issues that may have an Epic parent, and Task children.
• Tasks. These are Github issues that have a Story as a parent.

It would be nice to make it simple to turn an existing story into an epic, and then create stories under that epic. I'd also like to make it simple to create new stories under an existing epic, and create tasks under stories (and re-parent them as well). I'm not sure how important it is to re-parent and of these.