Allow HTML in Toastr alerts

In 0.2.4, the toastr alerts where displaying ```<strong>Error</strong> ```

![hmtl_broken](https://cloud.githubusercontent.com/assets/465717/4568732/ba5486fc-4f3d-11e4-808d-7aca81ca024c.png)

I've set them to allow HTML in the notifications and they now look like this:

![html_working](https://cloud.githubusercontent.com/assets/465717/4568733/beabf3b6-4f3d-11e4-9eb7-f79ffa78558f.png)

I removed the cookie requirement because if a user had the cookie set (and many users will have it set), they won't get the updated setting until the cookie expires. I couldn't see anywhere else in the code where the toastr settings are set in the cookie, so I'm assuming they're not important right now.