Add Twitter card data.

Fixes #8

Author: mblayman

_includes/head.html

@@ -6,6 +6,7 @@
     <meta name="description" content="{{ site.description }}">
     <link rel="canonical" href="{{ page.url | replace:'index.html','' | prepend: site.baseurl | prepend: site.url }}">
     {% include og.html %}
+    {% include twitter.html %}
 
     <link rel="icon" type="image/x-icon" href="/img/favicon.ico">
 

_includes/twitter.html

@@ -0,0 +1,6 @@
+<meta name="twitter:card" content="summary_large_image">
+<meta name="twitter:site" content="@pythonfrederick">
+<meta name="twitter:creator" content="@mblayman">
+<meta name="twitter:title" content="{{ site.title }}">
+<meta name="twitter:description" content="{{ site.description }}">
+<meta name="twitter:image" content="{{ site.url }}{% link img/logos/pythonfrederick.jpg %}">