Correct email picture url

app/mailers/notifier.rb

@@ -3,7 +3,7 @@ class Notifier < ActionMailer::Base
 
   default :from => AppConfig[:smtp_sender_address]
 
-  ATTACHMENT = File.read("#{Rails.root}/public/images/white_on_grey.png")
+  ATTACHMENT = File.read("#{Rails.root}/public/images/logo_caps.png")
 
   def self.admin(string, recipients, opts = {})
     mails = []
@@ -17,7 +17,7 @@ class Notifier < ActionMailer::Base
   def single_admin(string, recipient)
     @recipient = recipient
     @string = string.html_safe
-    attachments.inline['diaspora_white_on_grey.png'] = ATTACHMENT
+    attachments.inline['logo_caps.png'] = ATTACHMENT
     mail(:to => @recipient.email,
          :subject => I18n.t('notifier.single_admin.subject'), :host => AppConfig[:pod_uri].host)
   end

app/views/devise/mailer/invitation.html.haml

@@ -5,7 +5,7 @@
     = render :partial => 'notifier/notifier_css'
   %body
     %header
-      = image_tag AppConfig[:pod_url] + 'images/diaspora_white_on_grey.png'
+      = image_tag AppConfig[:pod_url] + 'images/logo_caps.png'
     #container
       - @invs = @resource.invitations_to_me
       %p

app/views/layouts/notifier.html.haml

@@ -5,6 +5,6 @@
     = render :partial => 'notifier_css'
   %body
     %header
-      = image_tag attachments['diaspora_white_on_grey.png'].url, :alt => "DIASPORA"
+      = image_tag attachments['logo_caps.png'].url, :alt => "DIASPORA"
     #container
       = yield

app/views/notifier/_notifier_css.haml

@@ -11,8 +11,6 @@
     padding-left:15px;
   }
   header{
-    background-color:#333;
-    padding: 15px;
     margin-bottom: 25px;
   }
   p{