Add google analytics

Author: Tom Clark

_config.yml

@@ -1,43 +1,4 @@
-safe:        false
-auto:        false
-server:      false
-server_port: 4000
-baseurl:    /
-url: http://localhost:4000
-
-source:      .
-destination: ./_site
-plugins:     ./_plugins
-
-future:      true
-lsi:         false
-# pygments:    false
 pygments:    true
-# markdown:    maruku
 markdown:    kramdown
-permalink:   date
-
-maruku:
-  use_tex:    false
-  use_divs:   false
-  png_engine: blahtex
-  png_dir:    images/latex
-  png_url:    /images/latex
-
-rdiscount:
-  extensions: []
 
-kramdown:
-  auto_ids: true,
-  footnote_nr: 1
-  entity_output: as_char
-  toc_levels: 1..6
-  use_coderay: false
-  
-  coderay:
-    coderay_wrap: div
-    coderay_line_numbers: inline
-    coderay_line_numbers_start: 1
-    coderay_tab_width: 4
-    coderay_bold_every: 10
-    coderay_css: style
+google_analytics_tracking_id: UA-30727234-1