Merge pull request #202 from Code-dot-mil/meta

Add Content-Security-Policy meta tag

Author: Ari Chivukula

_includes/meta.html

@@ -0,0 +1,7 @@
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<meta charset="utf-8">
+<meta http-equiv="X-UA-Compatible" content="IE=edge">
+<meta http-equiv="Content-Security-Policy" content="frame-ancestors 'none'">
+
+<title>{% if page.title %}{{ page.title }} | {% endif %}{{ site.title }}</title>
+{% include favicon.html %}