Footer: use HTTPS where possible

src/_includes/footer.html

@@ -4,7 +4,7 @@
     <div>
       <i class="fa fa-flag"></i> Font Awesome {{ site.fontawesome.version }}
       <span class="hide-xs">&middot;</span><br class="hide-sm hide-md hide-lg">
-      Created by <a href="http://twitter.com/{{ site.fontawesome.author.twitter }}">Dave Gandy</a>
+      Created by <a href="https://twitter.com/{{ site.fontawesome.author.twitter }}">Dave Gandy</a>
     </div>
     <div>
       Font Awesome licensed under <a href="{{ site.fontawesome.license.font.url }}">{{ site.fontawesome.license.font.version }}</a>
@@ -14,7 +14,7 @@
       Documentation licensed under <a href="{{ site.fontawesome.license.documentation.url }}">{{ site.fontawesome.license.documentation.version }}</a>
     </div>
     <div>
-      Thanks to <a href="http://maxcdn.com"><i class="fa fa-maxcdn"></i> MaxCDN</a> for providing the excellent <a href="http://www.bootstrapcdn.com/#fontawesome_tab">BootstrapCDN for Font Awesome</a>
+      Thanks to <a href="http://maxcdn.com/"><i class="fa fa-maxcdn"></i> MaxCDN</a> for providing the excellent <a href="http://www.bootstrapcdn.com/#fontawesome_tab">BootstrapCDN for Font Awesome</a>
     </div>
     <div class="project">
       <a href="{{ site.fontawesome.github.url }}">GitHub Project</a> &middot;