Added isRoute() method to the Request class.

This method is useful for a couple of reasons:

1) When using named routes it's much simpler and cleaner than using Request::is(*pattern*)
2) If the underlying named route changes this code will still work, as opposed to Request::is() (which will require a rewrite of the pattern)

This method is particularly useful inside of views. For instance, it can be used it the following way:

<a class="{{ Request::isRoute('home') ? 'active' : '' }}" href= ...

Regards,
Chris

Signed-off-by: crhayes <chris@moderncognition.com>