Allow multiple affiliations for authors

examples/article.html

@@ -32,20 +32,20 @@
       {
         "author":"Chris Olah",
         "authorURL":"https://colah.github.io/",
-        "affiliation":"Google Brain",
-        "affiliationURL":"https://g.co/brain"
-      },
-      {
-        "author":"Shan Carter",
-        "authorURL":"https://shancarter.com/",
-        "affiliation":"Google Brain",
-        "affiliationURL":"https://g.co/brain"
+        "affiliations": [{"name": "Google Brain", "url": "https://g.co/brain"}]
       },
       {
         "author":"Ludwig Schubert",
         "authorURL":"https://shancarter.com/",
-        "affiliation":"Google Brain",
-        "affiliationURL":"https://g.co/brain"
+        "affiliations": [{"name": "Google Brain", "url": "https://g.co/brain"}]
+      },
+      {
+        "author":"Shan Carter",
+        "authorURL":"https://shancarter.com/",
+        "affiliations": [
+          {"name": "Google Brain", "url": "https://g.co/brain"},
+          {"name": "NYT", "url": "https://nytimes.com"}
+        ]
       }
     ],
     "katex": {
@@ -59,6 +59,7 @@
   <figure style="grid-column: page; margin: 1rem 0;"><img src="momentum.png" style="width:100%; border: 1px solid rgba(0, 0, 0, 0.2);"/></figure>
   <p>We often think of Momentum<d-cite key="mercier2011humans"></d-cite> as a means of dampening oscillations and speeding up the iterations, leading to faster convergence. But it has other interesting behavior. It allows a larger range of step-sizes to be used, and creates its own oscillations. What is going on?</p>
 </d-title>
+<d-byline></d-byline>
 <d-article>
   <a class="marker" href="#section-1" id="section-1"><span>1</span></a>
   <h2>A Brief Survey of Techniques</h2>