Show modal window with instructions if GH OAuth is not enables

app/views/projects/_github_import_modal.html.haml

+%div#github_import_modal.modal.hide
+  .modal-dialog
+    .modal-content
+      .modal-header
+        %a.close{href: "#", "data-dismiss" => "modal"} ×
+        %h3 GitHub OAuth import
+      .modal-body
+        You need to setup integration with GitHub first.
+        = link_to 'How to setup integration with GitHub', 'https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/integration/github.md'
+
+
+:javascript
+  $(function(){
+    var import_modal = $('#github_import_modal').modal({modal: true, show:false});
+    $('.how_to_import_link').bind("click", function(e){
+      e.preventDefault();
+      import_modal.show();
+    });
+    $('.modal-header .close').bind("click", function(){
+      import_modal.hide();
+    })
+  })

app/views/projects/new.html.haml

@@ -40,13 +40,18 @@
                 The import will time out after 4 minutes. For big repositories, use a clone/push combination.
                 For SVN repositories, check #{link_to "this migrating from SVN doc.", "http://doc.gitlab.com/ce/workflow/migrating_from_svn.html"}
 
-      - if github_import_enabled?
-        .project-import.form-group
-          .col-sm-2
-          .col-sm-10
+      .project-import.form-group
+        .col-sm-2
+        .col-sm-10
+          - if github_import_enabled?
             = link_to status_github_import_path do
               %i.fa.fa-github
               Import projects from GitHub
+          - else
+            = link_to '#', class: 'how_to_import_link light' do
+              %i.fa.fa-github
+              Import projects from GitHub
+            = render 'github_import_modal'
 
       %hr.prepend-botton-10