Adding and using a InflectedRoute class for default routes.

This will maintain backwards compatibility while still leaving room for
extensibility

src/Config/routes.php

@@ -58,23 +58,42 @@
 ];
 
 if ($prefixPattern && $pluginPattern) {
-	$match = ['prefix' => $prefixPattern, 'plugin' => $pluginPattern, 'defaultRoute' => true];
+	$match = [
+		'prefix' => $prefixPattern,
+		'plugin' => $pluginPattern,
+		'defaultRoute' => true,
+		'routeClass' => 'Cake\Routing\Route\InflectedRoute'
+	];
 	Router::connect('/:prefix/:plugin', $indexParams, $match + $pluginShortMatch);
 	Router::connect('/:prefix/:plugin/:controller', $indexParams, $match);
 	Router::connect('/:prefix/:plugin/:controller/:action/*', [], $match);
 }
 if ($pluginPattern) {
-	$match = ['plugin' => $pluginPattern, 'defaultRoute' => true];
+	$match = [
+		'plugin' => $pluginPattern,
+		'defaultRoute' => true,
+		'routeClass' => 'Cake\Routing\Route\InflectedRoute'
+	];
 	Router::connect('/:plugin', $indexParams, $match + $pluginShortMatch);
 	Router::connect('/:plugin/:controller', $indexParams, $match);
 	Router::connect('/:plugin/:controller/:action/*', [], $match);
 }
 if ($prefixPattern) {
-	$match = ['prefix' => $prefixPattern, 'defaultRoute' => true];
+	$match = [
+		'prefix' => $prefixPattern,
+		'defaultRoute' => true,
+		'routeClass' => 'Cake\Routing\Route\InflectedRoute'
+	];
 	Router::connect('/:prefix/:controller', $indexParams, $match);
 	Router::connect('/:prefix/:controller/:action/*', [], $match);
 }
-Router::connect('/:controller', ['action' => 'index']);
-Router::connect('/:controller/:action/*');
+Router::connect('/:controller', ['action' => 'index'], [
+	'defaultRoute' => true,
+	'routeClass' => 'Cake\Routing\Route\InflectedRoute'
+]);
+Router::connect('/:controller/:action/*', [], [
+	'defaultRoute' => true,
+	'routeClass' => 'Cake\Routing\Route\InflectedRoute'
+]);
 
 unset($prefixes, $prefixPattern, $plugins, $pluginPattern, $indexParams, $match);

src/Routing/Route/InflectedRoute.php

@@ -0,0 +1,68 @@
+<?php
+/**
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * For full copyright and license information, please see the LICENSE.txt
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link          http://cakephp.org CakePHP(tm) Project
+ * @since         3.0.0
+ * @license       http://www.opensource.org/licenses/mit-license.php MIT License
+ */
+namespace Cake\Routing\Route;
+
+use Cake\Routing\Route\Route;
+use Cake\Utility\Inflector;
+
+/**
+ * This route class will transparently inflect the controller and plugin routing
+ * parameters, so that requesting `/my_controller` is parsed as `['controller' => 'MyController']`
+ */
+class InflectedRoute extends Route {
+
+/**
+ * Parses a string URL into an array. If it mathes, it will convert the controller and
+ * plugin keys to their camelized form
+ *
+ * @param string $url The URL to parse
+ * @return mixed false on failure, or an array of request parameters
+ */
+	public function parse($url) {
+		$params = parent::parse($url);
+		if (!$params) {
+			return false;
+		}
+		if (!empty($params['controller'])) {
+			$params['controller'] = Inflector::camelize($params['controller']);
+		}
+		if (!empty($params['plugin'])) {
+			$params['plugin'] = Inflector::camelize($params['plugin']);
+		}
+		return $params;
+	}
+
+/**
+ * Reverse route plugin shortcut URLs. If the plugin and controller
+ * are not the same the match is an auto fail.
+ *
+ * @param array $url Array of parameters to convert to a string.
+ * @param array $context An array of the current request context.
+ *   Contains information such as the current host, scheme, port, and base
+ *   directory.
+ * @return mixed either false or a string URL.
+ */
+	public function match(array $url, array $context = array()) {
+		if (!empty($url['controller'])) {
+			$url['controller'] = Inflector::underscore($url['controller']);
+		}
+		if (!empty($url['plugin'])) {
+			$url['plugin'] = Inflector::underscore($url['plugin']);
+		}
+		return parent::match($url, $context);
+	}
+
+}
+

src/Routing/Route/PluginShortRoute.php

@@ -14,14 +14,14 @@
  */
 namespace Cake\Routing\Route;
 
-use Cake\Routing\Route\Route;
+use Cake\Routing\Route\InflectedRoute;
 
 /**
  * Plugin short route, that copies the plugin param to the controller parameters
  * It is used for supporting /:plugin routes.
  *
  */
-class PluginShortRoute extends Route {
+class PluginShortRoute extends InflectedRoute {
 
 /**
  * Parses a string URL into an array. If a plugin key is found, it will be copied to the