Use gulp-david to check deps

package.json

@@ -25,6 +25,7 @@
   "devDependencies": {
     "del": "^2.2.0",
     "gulp": "^3.9.1",
+    "gulp-david": "^0.4.2",
     "gulp-inline-css": "^3.0.0",
     "gulp-inline-image-html": "^0.2.1",
     "gulp-minify-html": "^1.0.5",

tasks/check-deps.js

@@ -0,0 +1,14 @@
+'use strict';
+
+var gulp = require('gulp'),
+    david = require('gulp-david');
+
+function checkDepsTask(){
+  gulp.task('check-deps', function checkDeps(){
+    gulp
+      .src('package.json')
+      .pipe(david());
+  });
+}
+
+module.exports = checkDepsTask;