Fix missing import. Remove unused dev dependencies.

Author: ricardo.brandao

gulpfile.js

@@ -1,6 +1,7 @@
 /* jshint node:true, camelcase:false */
 var gulp = require('gulp');
 var karma = require('karma').server;
+var merge = require('merge-stream');
 var plug = require('gulp-load-plugins')();
 
 var paths = {

package.json

@@ -38,8 +38,6 @@
     "jquery": ">=1.12.0"
   },
   "devDependencies": {
-    "del": "^0.1.3",
-    "glob": "^4.0.6",
     "gulp": "^3.8.10",
     "gulp-bytediff": "^0.2.0",
     "gulp-jscs": "^1.3.0",