Use https for all assets (solves mixed content warning from Firefox 23)

scipost/templates/scipost/index.html

@@ -101,14 +101,14 @@
       <h1>SciPost is endorsed by</h1>
       <div class="row">
 	<div class="col-6">
-	  <a href="http://www.nwo.nl/en"><img src="{% static 'scipost/images/NWO_logo_EN.jpg' %}" alt="NWO logo" width='300px' /></a>
+	  <a href="https://www.nwo.nl/en"><img src="{% static 'scipost/images/NWO_logo_EN.jpg' %}" alt="NWO logo" width='300px' /></a>
 	  <p id="NWOOpenAccess">All articles published in SciPost Journals fulfill the Gold standard Open Access requirements of the NWO, as 
-	    stipulated on the NWO’s <a href="http://www.nwo.nl/en/policies/open+science">Open Science page</a>.</p>
+	    stipulated on the NWO’s <a href="https://www.nwo.nl/en/policies/open+science">Open Science page</a>.</p>
 	</div>
 	<div class="col-1">
 	</div>
 	<div class="col-4">
-	  <a href="http://www.fom.nl/live/english/home.pag"><img src="{% static 'scipost/images/FOMlogo_fc.jpg' %}" alt="FOM logo" width='100px' /></a>
+	  <a href="https://www.fom.nl"><img src="{% static 'scipost/images/FOMlogo_fc.jpg' %}" alt="FOM logo" width='100px' /></a>
 	  <p style="font-size: 50%">FOM is part of NWO</p>
 	</div>
       </div>
@@ -116,7 +116,7 @@
     <div class="col-6">
       <h1>SciPost is a member of</h1>
       <br/>
-      <a href="http://www.crossref.org"><img src="http://assets.crossref.org/logo/crossref-logo-200.svg" width="100px" alt="Crossref logo"></a>
+      <a href="http://www.crossref.org"><img src="https://assets.crossref.org/logo/crossref-logo-200.svg" width="100px" alt="Crossref logo"></a>
     </div>
   </div>
 </section>