Add a prefixed counter i.e. -> "(5) Site Title"

[clamstew]

There are a lot of use cases for this new updates, new messages and it lets the user know stuff is happening when they are on another tab.

Either an event or observable would communicate from the service to the directive to update the count. Then scopes and other services can call ngDynamicTitleService.setCount(int num) on various events to set the count.

This seems within the domain of this library that controls the web page </title> text.