Added multiple author support

exampleSite/data/authors/nunocoracao.json

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+{
+    "name": "Nuno Coração",
+    "image" : "img/nuno_avatar.jpg",
+    "bio": "Theme Creator",
+    "social": {
+        "linkedin": "https://linkedin.com/in/nunocoracao",
+        "twitter": "https://twitter.com/nunocoracao",
+        "instagram": "https://instagram.com/nunocoracao",
+        "medium": "https://medium.com/@nunocoracao",
+        "github": "https://github.com/nunocoracao",
+        "goodreads": "http://goodreads.com/nunocoracao",
+        "keybase": "https://keybase.io/nunocoracao",
+        "reddit": "https://reddit.com/user/nunoheart"
+    }
+}

exampleSite/data/authors/secondauthor.json

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+{
+    "name": "Dummy Second Author",
+    "image" : "img/author2.png",
+    "bio": "Dummy",
+    "social": {
+        "linkedin": "https://linkedin.com/in/nunocoracao",
+        "twitter": "https://twitter.com/nunocoracao",
+        "instagram": "https://instagram.com/nunocoracao",
+        "medium": "https://medium.com/@nunocoracao",
+        "github": "https://github.com/nunocoracao",
+        "goodreads": "http://goodreads.com/nunocoracao",
+        "keybase": "https://keybase.io/nunocoracao",
+        "reddit": "https://reddit.com/user/nunoheart"
+    }
+}