Refresh problems when switching pages #111

Hi everyone,
I started using the ui-codemirror directive a few days ago, and I have to say it is great. I however stumbled upon some refresh problems in a page with a parameter (not sure it is relevent though). What happens is that in some cases, my code is not rendered in the div where I use the directive. I have to click inside the element to have my code visible. After a bit of research, I came accross a StackOverflow post that helped me solve the problem.
I actually changed ngModel.$render (line 118 in ui-codemirror.js) to include a refresh using timeout after setValue:

var safeViewValue = ngModel.$viewValue || '';
      codemirror.setValue(safeViewValue);
        setTimeout(function() {
            codemirror.refresh();
        }, 100);

I don't think it is ideal/perfect, but it works...
I will try to post a plnkr of the not-working example later, to try and give a better overview of the problem. If I manage to reproduce it clearly, I will try and submit a PR comprising this fix (if it suits you of course).
Best regards,
Hugues