optimize loading of scripts

Author: ShMcK

_includes/base/scripts.html

@@ -1,10 +1,9 @@
 <!-- Scripts -->
-<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
-<script src="//cdnjs.cloudflare.com/ajax/libs/jquery-smooth-scroll/1.7.2/jquery.smooth-scroll.min.js"></script>
-<script src="//cdnjs.cloudflare.com/ajax/libs/skel/3.0.1/skel.min.js"></script>
-<script src="//cdnjs.cloudflare.com/ajax/libs/jquery.lazyload/1.9.1/jquery.lazyload.min.js"></script>
+<script src="https://code.jquery.com/jquery-3.1.0.slim.min.js" integrity="sha256-cRpWjoSOw5KcyIOaZNo4i6fZ9tKPhYYb6i5T9RSVJG8=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-smooth-scroll/2.0.0/jquery.smooth-scroll.min.js" defer></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/skel/3.0.1/skel.min.js" defer></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery.lazyload/1.9.1/jquery.lazyload.min.js" defer></script>
 <!--[if lte IE 8]><script src="{{ "/js/ie/respond.min.js" | prepend: site.baseurl }}"></script><![endif]-->
-<script src="{{ " /dist/build.min.js " | prepend: site.baseurl }}"></script>
+<script src="{{ " /dist/build.min.js " | prepend: site.baseurl }}" defer></script>
 <!-- GA -->
-<script>!function(e,t,a,n,c,s,o){e.GoogleAnalyticsObject=c,e[c]=e[c]||function(){(e[c].q=e[c].q||[]).push(arguments)},e[c].l=1*new Date,s=t.createElement(a),o=t.getElementsByTagName(a)[0],s.async=1,s.src=n,o.parentNode.insertBefore(s,o)}(window,document,"script","https://www.google-analytics.com/analytics.js","ga"),ga("create","UA-44377274-8","auto"),ga("send","pageview");
-</script>
+

dist/build.min.js

@@ -9,13 +9,8 @@ const cleanCSS = require('gulp-clean-css');
 gulp.task('compress', function (cb) {
   pump([
         gulp.src([
-          'js/lib/jquery.scrollex.min.js',
-          'js/lib/jquery.scrolly.min.js',
-          // 'js/lib/animatedModal.min.js',
-          'js/lib/png2gif.min.js',
-          'js/lib/jquery.sticky.js',
+          'js/lib/*.js',
           'js/*.js',
-          'ga/min.js'
         ]),
         concat('build.min.js'),
         uglify(),

gulpfile.js

@@ -42,7 +42,8 @@ <h2>{{summary.title}}</h2>
         <iframe
           width="574px"
           height="328px"
-          src="https://www.youtube.com/embed/DbLpdgrYVOU"
+          src=""
+          data-src="https://www.youtube.com/embed/DbLpdgrYVOU"
           frameborder="0"
           allowfullscreen></iframe>
     </div>