Merge branch 'dropdown-right-align' into 'master'

Dropdown alignment

Hopefully the JS will stop this happening in future as well!

Closes #14386 

![Screen_Shot_2016-03-18_at_12.54.32](/uploads/d11b51d3577df3a19b8b3a0fd7b69788/Screen_Shot_2016-03-18_at_12.54.32.png)

See merge request !3298

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

@@ -16,7 +16,7 @@
         - else
           Name
         %b.caret
-      %ul.dropdown-menu
+      %ul.dropdown-menu.dropdown-menu-align-right
         %li
           = link_to namespace_project_branches_path(sort: nil) do
             Name

app/views/projects/tags/_download.html.haml

@@ -6,7 +6,7 @@
     %span.caret
     %span.sr-only
       Select Archive Format
-  %ul.col-xs-10.dropdown-menu{ role: 'menu' }
+  %ul.dropdown-menu.dropdown-menu-align-right{ role: 'menu' }
     %li
       = link_to archive_namespace_project_repository_path(project.namespace, project, ref: ref, format: 'zip'), rel: 'nofollow' do
         %i.fa.fa-download