Add basic toc support

exampleSite/content/posts/goisforlovers.md

@@ -8,6 +8,7 @@ tags = [
     "development",
 ]
 date = "2014-04-02"
+toc = true
 +++
 
 Hugo uses the excellent [Go][] [html/template][gohtmltemplate] library for

exampleSite/content/posts/hugoisforlovers.md

@@ -7,6 +7,7 @@ tags = [
     "development",
 ]
 date = "2014-04-02"
+toc = true
 +++
 
 ## Step 1. Install Hugo

exampleSite/content/posts/migrate-from-jekyll.md

@@ -1,6 +1,7 @@
 ---
 date: 2014-03-10
 title: Migrate to Hugo from Jekyll
+toc: true
 ---
 
 ## Move static content to `static`