Merge branch 'code-import-error-ui-improvements' into 'master'

Improve error message display when project fails to import

Follow-up to !1134.

New screenshot:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/c1a8ffa30ab3b78010e16cf65c2ff438/image.png)

See merge request !1138

app/views/import/base/create.js.haml

@@ -26,4 +26,4 @@
 - else
   :plain
     job = $("tr#repo_#{@repo_id}")
-    job.find(".import-actions").html("<p class='alert alert-danger'>Error saving project: #{escape_javascript(@project.errors.messages.to_s)}</p>")
+    job.find(".import-actions").html("<i class='fa fa-exclamation-circle'> Error saving project: #{escape_javascript(@project.errors.full_messages.join(','))}</i>")