fix(app): use https:// in the Analytics script

Ref yeoman/generator-webapp#530
       h5bp/html5-boilerplate@eee759b
       https://developers.google.com/speed/libraries/?csw=1#libraries
       https://github.com/konklone/cdns-to-https#conclusion-cdns-should-redirect-to-https

templates/common/app/index.html

@@ -69,7 +69,7 @@
        !function(A,n,g,u,l,a,r){A.GoogleAnalyticsObject=l,A[l]=A[l]||function(){
        (A[l].q=A[l].q||[]).push(arguments)},A[l].l=+new Date,a=n.createElement(g),
        r=n.getElementsByTagName(g)[0],a.src=u,r.parentNode.insertBefore(a,r)
-       }(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+       }(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
 
        ga('create', 'UA-XXXXX-X');
        ga('send', 'pageview');