added gravatar support

app/helpers/application_helper.rb

@@ -49,4 +49,8 @@ module ApplicationHelper
   def privileged?(user)
     (current_user && (current_user == user || current_user.admin?)) ? true : false
   end
+
+  def gravatar_url(user)
+    "//www.gravatar.com/avatar/#{Digest::MD5.hexdigest(user.email)}"
+  end
 end

app/views/shared/_answerbox.html.haml

@@ -2,7 +2,7 @@
   .panel-heading
     .media
       %a.pull-left{href: '#'}
-        %img.img-rounded.img-answerbox
+        %img.img-rounded.img-answerbox{src: gravatar_url(a.question.user)}
       .media-body
         %h6.text-muted.media-heading.answerbox-question-user= user_screen_name a.question.user, a.question.author_is_anonymous
         %p.answerbox-question-text= a.question.content

app/views/user/show.html.haml

@@ -4,7 +4,7 @@
       .panel-body
         .row
           .col-md-12.col-xs-12.col-sm-9
-            %img.img-rounded.img-profile
+            %img.img-rounded.img-profile{src: gravatar_url(@user)}
         - if @user.display_name.blank?
           %h1= @user.screen_name
         - else