feature #7 Provides support for the PATCH method for HTTP (ramsey)

This PR was merged into the 1.2.x-dev branch.

Discussion
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Provides support for the PATCH method for HTTP

This pull request allows Silex routes to be specified to handle the `PATCH` method for HTTP. Without this, when trying to specify that a route accepts `PATCH` requests, Silex throws a `BadMethodCallException` with the message `Method "Silex\Route::patch" does not exist.`

#### References:

* [PATCH Method for HTTP](http://tools.ietf.org/html/rfc5789)

Commits
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0f6956d Provides support for the PATCH method for HTTP

src/Silex/Application.php

@@ -259,6 +259,19 @@ public function delete($pattern, $to = null)
         return $this['controllers']->delete($pattern, $to);
     }
 
+    /**
+     * Maps a PATCH request to a callable.
+     *
+     * @param string $pattern Matched route pattern
+     * @param mixed  $to      Callback that returns the response when matched
+     *
+     * @return Controller
+     */
+    public function patch($pattern, $to = null)
+    {
+        return $this['controllers']->patch($pattern, $to);
+    }
+
     /**
      * Adds an event listener that listens on the specified events.
      *

src/Silex/ControllerCollection.php

@@ -139,6 +139,19 @@ public function delete($pattern, $to = null)
         return $this->match($pattern, $to)->method('DELETE');
     }
 
+    /**
+     * Maps a PATCH request to a callable.
+     *
+     * @param string $pattern Matched route pattern
+     * @param mixed  $to      Callback that returns the response when matched
+     *
+     * @return Controller
+     */
+    public function patch($pattern, $to = null)
+    {
+        return $this->match($pattern, $to)->method('PATCH');
+    }
+
     public function __call($method, $arguments)
     {
         if (!method_exists($this->defaultRoute, $method)) {

tests/Silex/Tests/ApplicationTest.php

@@ -46,6 +46,9 @@ public function testMatchReturnValue()
         $returnValue = $app->put('/foo', function () {});
         $this->assertInstanceOf('Silex\Controller', $returnValue);
 
+        $returnValue = $app->patch('/foo', function () {});
+        $this->assertInstanceOf('Silex\Controller', $returnValue);
+
         $returnValue = $app->delete('/foo', function () {});
         $this->assertInstanceOf('Silex\Controller', $returnValue);
     }

tests/Silex/Tests/RouterTest.php

@@ -130,6 +130,10 @@ public function testMethodRouting()
             return 'put resource';
         });
 
+        $app->patch('/resource', function () {
+            return 'patch resource';
+        });
+
         $app->delete('/resource', function () {
             return 'delete resource';
         });
@@ -140,6 +144,7 @@ public function testMethodRouting()
         $this->checkRouteResponse($app, '/resource', 'get resource');
         $this->checkRouteResponse($app, '/resource', 'post resource', 'post');
         $this->checkRouteResponse($app, '/resource', 'put resource', 'put');
+        $this->checkRouteResponse($app, '/resource', 'patch resource', 'patch');
         $this->checkRouteResponse($app, '/resource', 'delete resource', 'delete');
     }