feat(mystery): July 2015 goodies

Also makes the mystery box opening notification translatable and adds item graphics to it.

migrations/mystery_items.js

@@ -0,0 +1,32 @@
+var _id = '';
+var update = {
+  $addToSet: {
+    'purchased.plan.mysteryItems':{
+      $each:['back_mystery_201507','eyewear_mystery_201507']
+    }
+  }
+};
+
+/*var update = {
+  $set:{
+    'purchased.plan':{
+      customerId: "",
+      dateCreated: new Date(),
+      dateTerminated: null,
+      dateUpdated:new Date(),
+      gemsBought: 0,
+      mysteryItems: [],
+      paymentMethod: "Paypal",
+      planId : "basic_earned"
+    }
+  }
+};*/
+
+if (_id) {
+  // singular (missing items)
+  db.users.update({_id:_id}, update);
+} else {
+  // multiple (once @ start of event)
+  db.users.update({'purchased.plan.customerId':{$ne:null}}, update, {multi:true});
+}
+