Expose Mutable NSURLRequest

[uzegonemad]

This enables modification of the request, which is especially useful for adding extra headers to the request.

Before:

// Impossible to set custom header
TOWebViewController *webViewController = [[TOWebViewController alloc] initWithURL:[NSURL URLWithString:url]];
[self presentViewController:[[UINavigationController alloc] initWithRootViewController:webViewController] animated:YES completion:nil];

After:

TOWebViewController *webViewController = [[TOWebViewController alloc] initWithURL:[NSURL URLWithString:url]];
[webViewController.urlRequest setValue:[NSString stringWithFormat:@"Bearer %@", bearerToken] forHTTPHeaderField:@"Authorization"]; // POSSIBLE!
[self presentViewController:[[UINavigationController alloc] initWithRootViewController:webViewController] animated:YES completion:nil];