introduce organizations

app/views/organizations/index.html.haml

@@ -0,0 +1,17 @@
+.container
+  .row
+    .col-md-12.page-header
+      %h1
+        Organizations
+        .btn-group.pull-right
+          = link_to 'Add new', new_organization_path, class: 'btn btn-mini btn-success'
+    - @organizations.each do |organization|
+      .col-md-4
+        .thumbnail
+          = image_tag(organization.picture.thumb.url, width: '20%')
+          .caption
+            %h4
+              = organization.name
+            %button.btn.btn-success Conferences
+            = link_to 'Edit', edit_organization_path(organization), class: 'btn btn-mini btn-default'
+