Style admin->projects filter

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/admin/projects/index.html.haml

 .row
   .col-md-4
     .admin-filter
-      = form_tag admin_projects_path, method: :get, class: 'form-inline' do
+      = form_tag admin_projects_path, method: :get, class: '' do
         .form-group
-          = label_tag :name, 'Name:', class: 'control-label'
-          .col-sm-10
-            = text_field_tag :name, params[:name], class: "span2"
+          = label_tag :name, 'Name:'
+          = text_field_tag :name, params[:name], class: "form-control"
 
         .form-group
-          = label_tag :owner_id, 'Owner:', class: 'control-label'
-          .col-sm-10
+          = label_tag :owner_id, 'Owner:'
+          %div
             = users_select_tag :owner_id, selected: params[:owner_id], class: 'input-large input-clamp'
-        .form-group.visibility-levels
-          = label_tag :visibility_level, 'Visibility Levels', class: 'control-label'
-          - Project.visibility_levels.each do |label, level|
-            .col-sm-10
-              = check_box_tag 'visibility_levels[]', level, params[:visibility_levels].present? && params[:visibility_levels].include?(level.to_s)
-              %span.descr
-                = visibility_level_icon(level)
-                = label
-        .form-group
-          = label_tag :with_push, 'Not empty', class: 'control-label'
-          .col-sm-10
-            = check_box_tag :with_push, 1, params[:with_push]
-             
-            %span.light Projects with push events
-        .form-group
-          = label_tag :abandoned, 'Abandoned', class: 'control-label'
-          .col-sm-10
-            = check_box_tag :abandoned, 1, params[:abandoned]
-             
-            %span.light No activity over 6 month
-
-
+        .checkbox
+          = label_tag :with_push, 'Not empty'
+          = check_box_tag :with_push, 1, params[:with_push]
+           
+          %span.light Projects with push events
+        .checkbox
+          = label_tag :abandoned, 'Abandoned'
+          = check_box_tag :abandoned, 1, params[:abandoned]
+           
+          %span.light No activity over 6 month
 
+        %fieldset
+          %strong Visibility level:
+          .visibility-levels
+            - Project.visibility_levels.each do |label, level|
+              .checkbox
+                %label
+                  = check_box_tag 'visibility_levels[]', level, params[:visibility_levels].present? && params[:visibility_levels].include?(level.to_s)
+                  %span.descr
+                    = visibility_level_icon(level)
+                    = label
         .form-actions
           = submit_tag "Search", class: "btn submit btn-primary"
           = link_to "Reset", admin_projects_path, class: "btn"
+
   .col-md-8
     .ui-box
       .title