Minor CS fixes.

lib/renderers/json.js

@@ -1,3 +1,6 @@
+var json;
+var nrData = 0;
+
 function uncolor(str) {
     return str.replace(/\x1B\[\d+m/g, '');
 }
@@ -8,11 +11,9 @@ function stringify(data) {
 
 // -------------------------
 
-var nrData = 0;
-
 // In the json output, everything goes to stderr except
 // the final command result that goes to stdout.
-var json = {
+json = {
     begin: function () {
         process.stderr.write('[');
     },