Merge branch '15213-dialog-input' into 'master'

Add margin to top of form actions

Closes #15213

Also fixes other modal inputs (like add new directory, etc)  

![Screen_Shot_2016-04-20_at_1.47.14_PM](/uploads/14b474da2f86dcc3c1afd9e8ea09e812/Screen_Shot_2016-04-20_at_1.47.14_PM.png)

See merge request !3841

app/assets/stylesheets/pages/help.scss

@@ -59,8 +59,10 @@
   position: relative;
   overflow-y: auto;
   padding: 15px;
+
   .form-actions {
     margin: -$gl-padding+1;
+    margin-top: 15px;
   }
 }