Add Exact Time to Order Notes

It's important to have exact times when events occur in the orders status. A store manager can't say, "you cancelled your subscription around 2 months ago, and then you restarted it about 4 weeks ago". A store manager should have access to the exact date and time things happen.

So I've left the X event happened X time ago since it's easier to read and I've wrapped it in an `<abbr>` tag which users can hover over to get the exact date.

![Order Notes](https://f.cloud.github.com/assets/1065372/968869/0eb598f8-05b1-11e3-91f0-27e390469286.png)