use json reporter if --json is passed

Author: cloudhead

lib/vows.js

@@ -27,12 +27,15 @@ vows.options = {
     Emitter: events.EventEmitter,
     brief: false,
     json: false,
-    matcher: /.*/,
-    reporter: require('vows/reporters/console')
+    matcher: /.*/
 };
 
 vows.__defineGetter__('reporter', function () {
-    return vows.options.reporter;
+    if (vows.options.json) {
+        return require('vows/reporters/json');
+    } else {
+        return require('vows/reporters/console');
+    }
 });
 
 var stylize = require('vows/reporters/console').stylize;