Merge branch 'git-hooks-alignment' into 'master'

Remove .form-horizontal from git hooks page

Fix vertical alignment of git-hooks page   

![Screen_Shot_2016-06-23_at_10.34.06_AM](/uploads/aadc7d24238daad3bee3f748e5391b87/Screen_Shot_2016-06-23_at_10.34.06_AM.png)

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/18730

See merge request !499

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

@@ -6,7 +6,7 @@
 
 %hr.clearfix
 
-= form_for [:admin, @git_hook], html: { class: 'form-horizontal' } do |f|
+= form_for [:admin, @git_hook] do |f|
   -if @git_hook.errors.any?
     .alert.alert-danger
       - @git_hook.errors.full_messages.each do |msg|