Specify stringify transform in package.json

For consistency with how other transforms are specified, specify the
stringify transform in package.json instead of in code in the
create-bundle.js script and the Karma config.

h/static/scripts/karma.config.js

@@ -2,7 +2,6 @@
 
 // Karma configuration
 var path = require('path');
-var stringify = require('stringify');
 
 module.exports = function(config) {
   config.set({
@@ -59,11 +58,6 @@ module.exports = function(config) {
       configure: function (bundle) {
         bundle
           .transform('coffeeify')
-          .transform(stringify, {
-            appliesTo: {
-              includeExtensions: ['.html'],
-            },
-          })
           .plugin('proxyquire-universal')
           // fix for Proxyquire in PhantomJS 1.x.
           // See https://github.com/bitwit/proxyquireify-phantom-menace

package.json

@@ -102,7 +102,10 @@
   "browserify": {
     "transform": [
       "browserify-ngannotate",
-      "browserify-shim"
+      "browserify-shim",
+      ["stringify", {
+        "appliesTo": {"includeExtensions": [".html"]}
+      }]
     ]
   },
   "browser": {

scripts/gulp/create-bundle.js

@@ -11,7 +11,6 @@ var coffeeify = require('coffeeify');
 var exorcist = require('exorcist');
 var gulpUtil = require('gulp-util');
 var mkdirp = require('mkdirp');
-var stringify = require('stringify');
 var uglifyify = require('uglifyify');
 var watchify = require('watchify');
 
@@ -118,12 +117,6 @@ module.exports = function createBundle(config, buildOpts) {
 
   var bundle = browserify([], bundleOpts);
 
-  bundle.transform(stringify, {
-    appliesTo: {
-      includeExtensions: ['.html'],
-    },
-  });
-
   (config.require || []).forEach(function (req) {
     // When another bundle uses 'bundle.external(<module path>)',
     // the module path is rewritten relative to the