title: Watchify with gulp is not working
body: <p>I have created this gulp task for watchifying but it gives this error: Cannot read property 'cache' of undefined</p>
  
  <pre><code>gulp.task('browserify-With-Watch', function () {
  "use strict";
  var bundler = browserify({
      entries: ['src/js/ede-wrapper.js'], // Only need initial file, browserify finds the deps
      debug: true, // Gives us sourcemapping
      cache: {},
      packageCache: {},
      fullPaths: true
  });
  
  var watcher  = watchify(bundler);
  
  return watcher
      .on('update', function () { // When any files update
          watcher.bundle() // Create new bundle that uses the cache for high performance
              .pipe(source('src/js/ede-wrapper.js'))
              // This is where you add uglifying etc.
              .pipe(gulp.dest('dist'));
      })
      .bundle() // Create the initial bundle when starting the task
      .pipe(source('src/js/ede-wrapper.js'))
      .pipe(gulp.dest('dist'));
  });
  </code></pre>
  
  <p>This is the error i get</p>
  
  <pre><code>[17:06:04] Starting 'browserify-With-Watch'...
  [17:06:04] 'browserify-With-Watch' errored after 1.6 ms
  [17:06:04] TypeError: Cannot read property 'cache' of undefined
      at watchify (d:\KHOBI\Source\ede_js_sdk\node_modules\watchify\index.js:13:27)
      at Gulp.&lt;anonymous&gt; (d:\KHOBI\Source\ede_js_sdk\gulpfile.js:55:20)
      at module.exports (d:\KHOBI\Source\ede_js_sdk\node_modules\gulp\node_modules\orchestrator\lib\runTask.js:34:7)
      at Gulp.Orchestrator._runTask (d:\KHOBI\Source\ede_js_sdk\node_modules\gulp\node_modules\orchestrator\index.js:273:3)
      at Gulp.Orchestrator._runStep (d:\KHOBI\Source\ede_js_sdk\node_modules\gulp\node_modules\orchestrator\index.js:214:10)
      at Gulp.Orchestrator.start (d:\KHOBI\Source\ede_js_sdk\node_modules\gulp\node_modules\orchestrator\index.js:134:8)
      at C:\Users\hasithm\AppData\Roaming\npm\node_modules\gulp\bin\gulp.js:129:20
      at process._tickCallback (node.js:355:11)
      at Function.Module.runMain (module.js:503:11)
      at startup (node.js:129:16)
  </code></pre>
  
  <p>Hope this is not something wrong with the watchify version that I use</p>
  
  <p>Note: I have used gulp-browserify to browserify</p>