Blur button tags when clicked. Fixes #17748.

http://stackoverflow.com/questions/23443579/how-to-stop-buttons-from-staying-depressed-with-bootstrap-3

app/assets/javascripts/application.js.coffee

@@ -219,6 +219,10 @@ $ ->
     form = btn.closest("form")
     new ConfirmDangerModal(form, text)
 
+
+  $(document).on 'click', 'button', ->
+    $(this).blur()
+
   $('input[type="search"]').each ->
     $this = $(this)
     $this.attr 'value', $this.val()