This fixes gettext-ified strings to be unicodes
issued_on should be "an ISO 8601 date

... or a standard 10-digit Unix timestamp." per
https://github.com/mozilla/openbadges/wiki/Assertions#wiki-date-time
Fix #196: Revise awards JSON feed format

* Awards JSON feed format now looks more like the OpenBadges Backpack
  Displayer format.

    * JSON object iwth 'badges' property, listing award assertions

* Recent badges JSON feed lists BadgeObjects under 'badges' property

* Test updates