Add a meta tag for naver site verification (adityatelange#991)

Author: sunghyunjun

layouts/partials/head.html

@@ -32,6 +32,9 @@
 {{- if site.Params.analytics.bing.SiteVerificationTag }}
 <meta name="msvalidate.01" content="{{ site.Params.analytics.bing.SiteVerificationTag }}">
 {{- end }}
+{{- if site.Params.analytics.naver.SiteVerificationTag }}
+<meta name="naver-site-verification" content="{{ site.Params.analytics.naver.SiteVerificationTag }}">
+{{- end }}
 
 {{- /* Styles */}}