Merge branch 'dropdown-positioning' into 'master'

UI Improvement for the project page

This MR improves the positioning of the dropdown menu on the project page.
I've added the WIP because I didn't check if this can cause any tests to break.
I'll remove it once the CI is green.

Before:
![gitlab_dropdown_old](https://gitlab.com/haynes/gitlab-ce/uploads/ac30810abe9e75154edd2a896c9a4947/gitlab_dropdown_old.png)

After:
![gitlab_dropdown_new](https://gitlab.com/haynes/gitlab-ce/uploads/616c237fe26934ebbbc82f0ce73e72da/gitlab_dropdown_new.png)

This is the MR for the discussion in gitlab-org/gitlab-ce!971 .

/cc @dzaporozhets Can you review it please? 

See merge request !1199

CHANGELOG

 Please view this file on the master branch, on stable branches it's out of date.
 v 8.0.0 (unreleased)
+  - Improve dropdown positioning on the project home page (Hannes Rosenögger)
   - Upgrade browser gem to 1.0.0 to avoid warning in IE11 compatibilty mode (Stan Hu)
   - Fix "Reload with full diff" URL button in compare branch view (Stan Hu)
   - Remove user OAuth tokens from the database and request new tokens each session (Stan Hu)

app/assets/stylesheets/pages/projects.scss

@@ -30,6 +30,10 @@
     }
   }
+  .project-home-dropdown {
+    margin: 11px 3px 0;
+  }
+
   .project-home-desc {
     h1 {
       margin: 0;

app/views/projects/buttons/_dropdown.html.haml

@@ -2,7 +2,7 @@
   %span.dropdown
     %a.dropdown-toggle.btn.btn-new{href: '#', "data-toggle" => "dropdown"}
       = icon('plus')
-    %ul.dropdown-menu
+    %ul.dropdown-menu.dropdown-menu-right.project-home-dropdown
       - if can?(current_user, :create_issue, @project)
         %li
           = link_to url_for_new_issue do