No bug. Update to new way of detecting emacs

MozReview-Commit-ID: 4GJ2zg5vRN4

--HG--
extra : rebase_source : 378330a4280a901ce876e94d6d5fcda5ba71ac31

js/examples/jorendb.js

@@ -28,7 +28,7 @@ var lastExc = null;
 var todo = [];
 var activeTask;
 var options = { 'pretty': true,
-                'emacs': (os.getenv('EMACS') == 't') };
+                'emacs': !!os.getenv('INSIDE_EMACS') };
 var rerun = true;
 
 // Cleanup functions to run when we next re-enter the repl.