Wait for contact sync before opening inbox

Use a canned bootstrap progress animation in lieu of better design.

Fix #271 // FREEBIE

js/libtextsecure.js

@@ -39714,6 +39714,7 @@ function generateKeys(count, progressCallback) {
                     eventTarget.dispatchEvent(ev);
                     contactDetails = contactBuffer.next();
                 }
+                eventTarget.dispatchEvent(new Event('textsecure:contactsync'));
             });
         },
         handleGroups: function(groups) {