added open graph meta data to conference#show

app/views/conference/show.html.haml

@@ -1,8 +1,16 @@
+- content_for :head do
+  %meta{ :property => 'og:title', :content => '#{@conference.title}' }
+  %meta{ :property => 'og:image', :content => '(@conference.picture_url)' }
+  %meta{ :property => 'og:url', :content => '(@conference.short_title)' }
+  %meta{ :property => 'og:description', :content => '(@conference.description)'}
+  %meta{ :property => 'og:site_name', :content => (ENV['OSEM_NAME'] || 'OSEM') }
+  - end
+
 = content_for :title do
   = @conference.title
 
 #splash
-  - if @conference.splashpage
+  - if @conference.splashpage}
     #banner
       .container
         .row

app/views/layouts/application.html.haml

@@ -5,6 +5,7 @@
     %title= content_for?(:title) ? yield(:title) : (ENV['OSEM_NAME'] || 'OSEM')
     %meta{:content => "", :name => "description"}
     %meta{:content => "", :name => "author"}
+    %meta= content_for?(:head) ? yield(:head) : ('')
     = stylesheet_link_tag "application", :media => "all"
     = javascript_include_tag "application"