[ROUTES] Allow accept-header specification during router creation

Router:
- Fix calls to connect, most of them were misusing the function's params

URLMapper:
- Minor fixes
- Documentation
- Add support for accept-header specification

Plugins/*:
- Fix calls to connect

plugins/Linkback/LinkbackPlugin.php

@@ -338,8 +338,10 @@ class LinkbackPlugin extends Plugin
 
     public function onRouterInitialized(URLMapper $m)
     {
-        $m->connect('main/linkback/webmention', array('action' => 'webmention'));
-        $m->connect('main/linkback/pingback', array('action' => 'pingback'));
+        $m->connect('main/linkback/webmention',
+                    ['action' => 'webmention']);
+        $m->connect('main/linkback/pingback',
+                    ['action' => 'pingback']);
     }
 
     public function onStartShowHTML($action)