FIX: Creating styles for admin notice popup (Growl style)

When a page/object is modified/created in the CMS admin, a black popup appears in the top right. Currently this incorporates crude built-in styles. I have prettied this popup to create a more visually appealing style.

See screenshot below of before vs after:

![image](https://f.cloud.github.com/assets/1711444/858591/827e86ca-f56a-11e2-87d4-e05f3bde626e.png)