[#359,view/flot][m]: much better time series support by using flot time plugin - fixes #359.

* Note you still need to set the type of the field to time for this to work properly (i.e. we do not attempt to guess a column is dates as that is very error-prone).

test/view.flot.test.js

@@ -48,7 +48,9 @@ test('dates in graph view', function () {
       'series': ['y', 'z']
     }
   });
+  view.render();
   $('.fixtures').append(view.el);
+  view.redraw();
 
   view.remove();
 });