Ticket/11103 Styling Changes

1. I removed the title attribute from the notifications link because it was rendering html tags, and there was no easy way to fix it that I could find. The tooltip would show: `<strong>2</strong> Notifications`

2. I restyled the prosilver notification modal to look like the image at area51 ![here](http://area51.phpbb.com/phpBB/download/file.php?id=2125)

3. I also added drop shadow to the modal in subsilver2 because it was blending in with the background too much, needed some layered depth perception.

4. I restyled a bit the UCP Notifications in prosilver and subsilver2 also.
![screen](https://f.cloud.github.com/assets/303711/158109/171a8d88-76db-11e2-8ce3-1bb5446e70e2.jpg)