Explain "description:" in headers + add Gemfile for jekyll

Gemfile

@@ -0,0 +1 @@
+gem 'github-pages'

Gemfile.lock

@@ -0,0 +1,130 @@
+GEM
+  specs:
+    RedCloth (4.2.9)
+    activesupport (4.2.3)
+      i18n (~> 0.7)
+      json (~> 1.7, >= 1.7.7)
+      minitest (~> 5.1)
+      thread_safe (~> 0.3, >= 0.3.4)
+      tzinfo (~> 1.1)
+    blankslate (2.1.2.4)
+    celluloid (0.16.0)
+      timers (~> 4.0.0)
+    classifier-reborn (2.0.3)
+      fast-stemmer (~> 1.0)
+    coffee-script (2.4.1)
+      coffee-script-source
+      execjs
+    coffee-script-source (1.9.1.1)
+    colorator (0.1)
+    execjs (2.5.2)
+    fast-stemmer (1.0.2)
+    ffi (1.9.10)
+    gemoji (2.1.0)
+    github-pages (38)
+      RedCloth (= 4.2.9)
+      github-pages-health-check (~> 0.2)
+      jekyll (= 2.4.0)
+      jekyll-coffeescript (= 1.0.1)
+      jekyll-feed (= 0.3.0)
+      jekyll-mentions (= 0.2.1)
+      jekyll-redirect-from (= 0.8.0)
+      jekyll-sass-converter (= 1.2.0)
+      jekyll-sitemap (= 0.8.1)
+      jemoji (= 0.4.0)
+      kramdown (= 1.5.0)
+      liquid (= 2.6.2)
+      maruku (= 0.7.0)
+      mercenary (~> 0.3)
+      pygments.rb (= 0.6.3)
+      rdiscount (= 2.1.7)
+      redcarpet (= 3.3.1)
+      terminal-table (~> 1.4)
+    github-pages-health-check (0.3.1)
+      net-dns (~> 0.6)
+      public_suffix (~> 1.4)
+    hitimes (1.2.2)
+    html-pipeline (1.9.0)
+      activesupport (>= 2)
+      nokogiri (~> 1.4)
+    i18n (0.7.0)
+    jekyll (2.4.0)
+      classifier-reborn (~> 2.0)
+      colorator (~> 0.1)
+      jekyll-coffeescript (~> 1.0)
+      jekyll-gist (~> 1.0)
+      jekyll-paginate (~> 1.0)
+      jekyll-sass-converter (~> 1.0)
+      jekyll-watch (~> 1.1)
+      kramdown (~> 1.3)
+      liquid (~> 2.6.1)
+      mercenary (~> 0.3.3)
+      pygments.rb (~> 0.6.0)
+      redcarpet (~> 3.1)
+      safe_yaml (~> 1.0)
+      toml (~> 0.1.0)
+    jekyll-coffeescript (1.0.1)
+      coffee-script (~> 2.2)
+    jekyll-feed (0.3.0)
+    jekyll-gist (1.2.1)
+    jekyll-mentions (0.2.1)
+      html-pipeline (~> 1.9.0)
+      jekyll (~> 2.0)
+    jekyll-paginate (1.1.0)
+    jekyll-redirect-from (0.8.0)
+      jekyll (>= 2.0)
+    jekyll-sass-converter (1.2.0)
+      sass (~> 3.2)
+    jekyll-sitemap (0.8.1)
+    jekyll-watch (1.2.1)
+      listen (~> 2.7)
+    jemoji (0.4.0)
+      gemoji (~> 2.0)
+      html-pipeline (~> 1.9)
+      jekyll (~> 2.0)
+    json (1.8.3)
+    kramdown (1.5.0)
+    liquid (2.6.2)
+    listen (2.10.1)
+      celluloid (~> 0.16.0)
+      rb-fsevent (>= 0.9.3)
+      rb-inotify (>= 0.9)
+    maruku (0.7.0)
+    mercenary (0.3.5)
+    mini_portile (0.6.2)
+    minitest (5.7.0)
+    net-dns (0.8.0)
+    nokogiri (1.6.6.2)
+      mini_portile (~> 0.6.0)
+    parslet (1.5.0)
+      blankslate (~> 2.0)
+    posix-spawn (0.3.11)
+    public_suffix (1.5.1)
+    pygments.rb (0.6.3)
+      posix-spawn (~> 0.3.6)
+      yajl-ruby (~> 1.2.0)
+    rb-fsevent (0.9.5)
+    rb-inotify (0.9.5)
+      ffi (>= 0.5.0)
+    rdiscount (2.1.7)
+    redcarpet (3.3.1)
+    safe_yaml (1.0.4)
+    sass (3.4.16)
+    terminal-table (1.5.2)
+    thread_safe (0.3.5)
+    timers (4.0.1)
+      hitimes
+    toml (0.1.2)
+      parslet (~> 1.5.0)
+    tzinfo (1.2.2)
+      thread_safe (~> 0.1)
+    yajl-ruby (1.2.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  github-pages
+
+BUNDLED WITH
+   1.10.6

pages/overview.md

@@ -86,11 +86,15 @@ have a header with a particular form:
     layout: page
     title: simple site
     tagline: Easy websites with GitHub Pages
+    description: Minimal tutorial on making a simple website with GitHub Pages
     ---
 
 In the conversion of the site from Markdown to html, this bit says
 that the current file is to be converted with the “page”
 layout, and gives the title and the (optional) “tagline.”
+The "`description:`" part gets converted into
+`<meta name="description" content="Minimal tutorial on...">`
+which, in principle, may used in the results of google searches.
 
 The rest is basically plain Markdown, though the present site is
 configured to use [kramdown](http://kramdown.gettalong.org/) as the