Add new TimeFieldRenderer, make it default for Time fields

Uses a jQuery UI widget similar to datepicker:

https://fgelinas.com/code/timepicker/

tailbone/static/js/tailbone.js

@@ -112,6 +112,13 @@ $(function() {
     $('input[type=submit]').button();
     $('input[type=reset]').button();
 
+    /*
+     * Apply timepicker behavior to text inputs which are marked for it.
+     */
+    $('input[type=text].timepicker').timepicker({
+        showPeriod: true
+    });
+
     /*
      * When filter labels are clicked, (un)check the associated checkbox.
      */