Function to redirect routes.

Allows redirection of specified route patterns to a url or route.

There are times when I only want to redirect a route to another route or url.

This section allows for creating an ini file such as 

```
[redirects]
GET /route = /redirect
POST /route = @redirect
GET /f3site = http://www.fatfreeframework.com
```

or 
```php
$f3->redirect('GET /route', '/redirect');
```

It simplifies redirection of routes without having to create functions or handlers. It however cannot handle redirection to routes such as 
```php
$f3->redirect('GET /route', '//link.com');
```
without having to modify the ```reroute``` function