call cleanup on exceptions and ctr-c

lib/extensions.js

@@ -30,6 +30,15 @@ module.exports = function(realmConstructor) {
         if (realmConstructor.Sync.cleanup) {
             // FIXME: DOES THIS WORK ON BOTH NODE AND REACT NATIVE?
             process.on('exit', realmConstructor.Sync.cleanup);
+            process.on('SIGINT', function () {
+                realmConstructor.Sync.cleanup();
+                process.exit(2);
+            });
+            process.on('uncaughtException', function(e) {
+                realmConstructor.Sync.cleanup();
+                console.log(e.stack);
+                process.exit(99);
+            });
         }
     }